Sigil was designed to make it easy to create great ebooks using the EPUB format. If you are formatting books for your own use, or you are a professional editor publishing books on multiple platforms, then Sigil is for you. You can use Sigil to format and package your books into an EPUB that looks exactly the way you want it to using an advanced set of features that have made Sigil one of most popular EPUB editors available.
      This open-source and completely free software is written and supported entirely by volunteers. The current Sigil development team includes Doug Massay and Kevin Hendricks as co-lead developers and maintainers. Previous developers/authors include John Schember, Grant Drake and Dave Heiland. Sigil was originally created by Strahinja Markovic in 2009 and remains completely free to download and use. Support is also provided by other volunteers who contribute code, translations and helpful answers to user’s questions. See the Help=&gt;About menu in Sigil for a complete list of contributors.
      Some Sigil features:
      
        Free and open source software under GPLv3
        Multi-platform: runs on Windows, Mac, and Linux
        Full UTF-16 support
        EPUB 2 and EPUB 3 spec support
        Multiple Views: Code View and Preview View
        Complete control over directly editing EPUB syntax in Code View
        Table of Contents generator with multi-level heading support
        Metadata editor
        User interface translated into many languages
        Themeable icons
        Spell checking with default and user configurable dictionaries
        Full Regular Expression (PCRE) support for Find &amp; Replace
        Supports import of EPUB and HTML files, images, and style sheets
        All imported files can have their formatting mended, and your code can be optionally “prettified”
        Plugin Support
        Checkpoint support (compare “snapshots” of changes)
        Pies and Puppies!
      
    

Sigil

Sorting documents is a machine's job. Paperwork is an easy-to-use application which allows you to find in all your documents when you need them. Type a few keywords in the search bar and the list of papers will shrink to only the relevant content.This is where the magic happens: Paperwork uses automatically optical character recognition (OCR) to convert your papers into searchable documents.Main features are:Scanner supportPDF supportAutomatic detection of page orientationOCRDocument labelsAutomatic guessing of the labels to apply on new documentsSearchKeyword suggestionsQuick edit of scans

Paperwork

CorePDF is a lightweight PDF app based on Qt Framework based on poppler.

CorePDF

If PDF is electronic paper, then PDFtk is an electronic staple-remover, hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. PDFtk is a simple tool for doing everyday things with PDF documents, and PDF Chain is a nice frontend application to it.Features:Merge PDF Documents or Collate PDF Page ScansSplit PDF Pages into a New DocumentRotate PDF Documents or PagesDecrypt Input as Necessary (Password Required)Fill PDF Forms with X/FDF Data and/or Flatten FormsGenerate FDF Data Stencils from PDF FormsApply a Background Watermark or a Foreground StampReport PDF Metrics, Bookmarks and MetadataAdd/Update PDF Metrics, Bookmarks or MetadataAttach Files to PDF Pages or the PDF DocumentUnpack PDF AttachmentsBurst a PDF Document into Single PagesUncompress and Re-Compress Page StreamsRepair Corrupted PDF (where possible)---------- DISCLAIMER ----------Latest version of this software is very old and so it may contain bugs, so to be on the safe side make sure to NOT open any untrusted pdf files with it. For this same reason we have limited this application to only save files to standard locations: "Downloads", "Documents" and "Pictures". You can also save to external devices (like USB pendrive).

PDF Chain

PDF Chain is a graphical user interface for the PDF Toolkit (PDFtk)


      Progress is a simple application that organises your tasks on a board and
      allows the user to put them into different card lists across the board.
    
    

Progress


      Keep your personal email history private and secure by migrating it to ProtonMail using the Import-Export app.
    
      
        Bring your mailbox:

      Your email is a record of your personal conversations and important milestones. Bring those memories with you when you upgrade to a secure and private inbox with ProtonMail.
        Keep only whats important:

      Old newsletters, random receipts, special offers - your inbox can fill up fast. The Import-Export app lets you easily select which messages you want to import. 
        Secure conversation history:

      When you import your emails, the Import-Export app automatically encrypts them before they leave your device. That way only you can access your personal messages. 
      
    

ProtonMail Import-Export app

Sync your emails, calendars, and contacts securely with Proton in one click

Start logging any task's time to completion, with the ability to stop the timer at any moment, with notifications for longer task sessions.Quit anytime with the shortcut Ctrl + Q

Khronos

Scrivano is a note-taking application aimed at those who prefer handwriting over typing. It offers a simple and easy to use interface to write down your thoughts and ideas. The app gives you an infinite vertical canvas (but limited horizontal space) without sacrificing the ability to easily export your notes in traditional printing formats (e.g. A2, A3, A4, etc...).Here is a summary of the most important features:4 different paper backgrounds to choose from: Plain, Lined, Grid or Dotted with customisable spacing and backgrounds.Grid Snapping: in Scrivano you can toggle the grid snapping feature so that your drawings will automatically snap to grid lines in the background. This is very useful to easily draw tables, diagrams and lines.Automatic filling of strokes: toggle the paint bucket in the toolbar to fill your drawing shapes and strokes.Stickers: save your frequently used symbols and diagrams, so you can easily drag and drop whenever you need them.Insert images: paste or drag and drop any image on the canvas to unleash your creativity!Offline saving: save your notes anywhere on your main drive, so you can manage them however you please.Laser: Scrivano offers a special laser tool to quickly draw over your notes. Incredibly useful when sharing your screen or presenting something!Annotate PDF files: You can import your PDF books, lecture slides, articles and documents to annotate them using Scrivano's built-in inking tools.NOTE: The flatpak version of the app runs in a sandbox environment and it can only read/write files from these folders: xdg-desktop, xdg-documents, xdg-download and xdg-pictures. If you want to circumvent this for more freedom, you can use Flatseal to override these restrictions.

Scrivano for Handwritten Notes

A note-taking application for those who prefer handwriting over typing.

Simple editor for PDF metadata. Allows editing the basic as well as all the extended (XMP) metadata.

Pdf Metadata Editor


        GoldenDict is a feature-rich dictionary lookup program, supporting multiple
        dictionary formats (StarDict/Babylon/Lingvo/Dictd/AARD/MDict/SDict) and
        online dictionaries, featuring perfect article rendering with the complete
        markup, illustrations and other content retained, and allowing you to type
        in words without any accents or correct case.
    
    

GoldenDict

Qpdf Tools is an Qt interface for Ghostscript and QPDF.
      Qpdf Tools makes possible for normal users to manage their PDFs.
      With Qpdf Tools, you can easily compress, split, merge and even rotate your pdf documents.
    

Qpdf Tools

Gnome next meeting applet is an applet for Gnome using calendars from Gnome Online Accounts to show the time to your next meeting and easily open the meeting url.

Features includeUse Gnome Online Account for calendar sources.Make it easy to know how long you have until your next meeting.Detect video conference URLs allow to quickly click on it to join (Google Meet, Zoom, Bluejeans, supported).Shows the documents link attached to the current meeting.Change icons 5mn before and after meeting.Fully configurable.

Gnome Next Meeting Applet

Story Architect is a modern application for authors that combines flexibility and simplicity of the user interface with an incredibly rich set of features. It allows you to work on projects of different genres and forms, store all the information about your stories inside one project, and provides many opportunities to improve the life of authors.
      The main features of the application:
      
        Ability to maintain a project bible
        Detailed descriptions of the characters + diagram of their relationship
        Detailed descriptions of locations + map of locations
        Ability to work with screenplays, comic books, plays, audio drama and novels
        Specialized editors that automate the work on each of the forms of your works
        Ability to create an unlimited number of series within one project
        Ability to save your works in DOCX and PDF formats
        Opportunity to work on projects offline as well as collaborate with coauthors in real-time
      
      In par with the big modules, Story Architect provides a bunch of small tools for improving writers workflow:
      
        Poster designer tool
        Character name generator
        Character photo generator
        Logline generator
        AI Assistant
        Timer for organizing writing sprints
        Corkboard
        Statistical and visual reports
        Mind maps
        and much more
      
      Starc is being developed with strong authors’ involvement and support so we don’t waste the app performance on the features you don’t need.
      If you have any ideas, wishes, suggestions or comments, we are happy to discuss them to make the app even better! You can contact us through the feedback form on the site, or in any of the social networks.
      Happy writing!
    

Story Architect (STARC)

PdfJumbler is a simple tool to rearrange, merge, delete and rotate pages in PDF files.

PdfJumbler

Simple tool to rearrange, merge, delete and rotate pages in PDF files

GoldenDict-ng is a feature-rich dictionary lookup program, supporting multiple dictionary formats, featuring perfect article rendering with the complete markup, illustrations and other content retained, and allowing you to type in words without any accents or correct case.

GoldenDict-ng

The ultimate task management solution for seamless organization and efficiency.
      Done is a user-friendly app that allows you to effortlessly consolidate your existing task providers into a single application for optimal productivity and organization.
      Current features:
      
        Create tasks and lists
        Add task service providers
        Edit your tasks and lists
        Delete tasks and lists
      
    

Done


	    The Pomodoro technique is efficient for tasks you find boring, but having to take a break when you are 100% concentrated in something you like might be annoying. That's why the Flowtime technique exists: take appropiate breaks without loosing you **flow**.
	  
    

Flowtime


      Tellico is an application for organizing your collections.
      It provides default templates for books, bibliographies, videos, music, video games, coins, stamps, trading cards, comic books, and wines.
      It allows you to enter your collection in a catalogue database, saving many different properties like title, author, etc.
    
      Features:
      
        Supports default collections of books, bibliographic entries, videos, music, video games, comic books, coins, stamps, trading cards, wines, board games, and file catalogs
        Supports user-defined custom collections
        Supports any number of user-defined fields, of several different types: text, paragraph, list, checkbox, number, URL, date, images, and combinations
        Handles entries with multiple authors, genres, keywords, etc
        Automatically formats titles and names
        Supports collection searching and view filtering
        Sorts and groups collection by various properties
        Allows customizable entry templates through XSLT
        Imports MODS, Bibtex, RIS, CSV, PDF metadata, and many other formats
        Exports to Bibtex, ONIX, CSV, HTML, and other formats
        Imports information directly from Amazon.com, IMDb, z39.50 servers, PubMed, SRU servers, CrossRef.org, various other websites, and from external scripts
        Imports CDDB data for cataloging audio CDs
        Scans and imports audio file collections, such as mp3 or ogg
      
    

Tellico

Apache Directory Studio is a complete directory tooling platform intended to be used with any LDAP server however it is particularly designed for use with ApacheDS. It is an Eclipse RCP application, composed of several Eclipse (OSGi) plugins, that can be easily upgraded with additional ones.The LDAP Browser has been designed to work with almost any LDAP server available. It not only permits to read and display the tree of your LDAP Server but also allows you to modify it by creating, editing or removing entries.The LDIF Editor is a tool for editing LDIF files. It provides syntax highlighting and content assistance.The Schema Editor has been designed to edit the schema files in the OpenLDAP format. It allows you to edit easily attribute types and object classes for Apache Directory Server and OpenLDAP.Apache Directory Studio bundles the latest version of the LDAPV3 certified ApacheDS. Creating and launching a new LDAP server now takes less than 10 seconds!The ApacheDS Configuration Editor can be used to edit the server configuration ('server.xml' and 'config.ldif' files) of an Apache Directory Server installation.The ACI Editor allows you to define, for an entry or a set of entries, graphically or manually (in souce code mode), an ACI (Access Control Information) item specification for Apache Directory Server.

Apache Directory Studio

Block editing: SiYuan, the only important core concept is Content block. The content block
      can be formed through the formatting format, so that we can organize our thoughts and
      knowledge at the block-level granularity, and it is also convenient for reading and outputting
      long content.
      Privacy security Encrypted cloud, worry-free privacy: Data is stored entirely on the device
      under the control of the user. Even if there is no network, even if the cloud service is down,
      it can still be used locally without restrictions. No offline, no notes.
      Bidirectional link: Documentation page are also blocks, reducing mental load. All content
      exists on a block basis, and documentation pages are no exception. Blocks can be converted to
      each other, splitting, reorganizing and moving do not affect existing links.
      List outline: Sort out the main points, logically layered
      Multi-device data sync: Keep data complete and consistent
    

SiYuan

A privacy-first personal knowledge management system, support fine-grained block-level reference and Markdown WYSIWYG

An easy-to-use desktop tool to recognise and extract text from images, PDFs and Google Books. It uses the Tesseract OCR engine, combined with modern and efficient preprocessing and analysis pipelines, to produce high quality output in plain text, hOCR and searchable PDF format. The tool has been built with a focus on OCR of historical printed works, but it includes modern language options and also works well on modern printed works.
    

Rescribe

Skrooge is a personal finance manager powered by KDE that aims to be simple and intuitive. Skrooge allows you to keep track of your expenses and income, categorize them, and build reports of them.
      Features:
      
        QIF, CSV, SKROOGE, KMYMONEY import/export
        Microsoft Money, OFX, QFX, MT940, GNUCASH, GRISBI, HOMEBANK and MONEY MANAGER EX import
        Advanced Graphical Reports
        Multiple tabs to help you organize your work
        Infinite undo/redo (even after the file was closed !)
        Instant filtering on transactions and reports
        Infinite category levels
        Mass update of transactions
        Scheduled transactions
        Track refund of your expenses
        Automatically process transactions based on search conditions
        Multiple currencies
        Budget
        Dashboard
        Advice
      
    

Skrooge

sleek is an open-source (FOSS) todo manager based on the todo.txt syntax. Stripped down to only the most necessary features, and with a clean and simple interface, sleek aims to help you focus on getting things done.
      All classic todo.txt attributes are supported and enhanced by additional features. Creating todos is straightforward, and tag-based filtering in tandem with highly customisable grouping and smart full-text search allows for rapid information retrieval. Completed todos can be hidden or archived into separate done.txt files. Easy integration with other todo.txt apps is facilitated by continuously scanning todo.txt files for changes.
      sleek is available for Windows, macOS and Linux, and in several languages.
      Features
      
        Uses existing todo.txt files or creates new ones
        File watcher scans todo.txt files for changes
        Simultaneously manage multiple todo.txt files
        Add and search for todos by priority, contexts, projects, due date, creation date, completion date, recurrence (repeating todo), threshold dates (deferred todos), pomodoro intervals
        Filter, sort, and group todos by all available attributes
        Invert the sorting of each group
        Find todos using a sophisticated advanced search based on the todo.txt syntax
        Inline autocomplete available for adding contexts and projects
        Multi-line and bulk todo creation
        Due dates, threshold dates, recurrences, pomodoros and priorities can be selected by built-in picker elements
        Speaking dates can be entered for due and threshold dates
        Marking a recurring todo as complete, will create a new todo
        Navigable via keyboard shortcuts
        Due date notifications
        Toggle between dark and light mode
        Completed todos can be shown, hidden, and archived
        Language options: English, German, Italian, Spanish, French, Simplified Chinese, Brazilian Portugese, Japanese, Turkish, Hungarian, Czech, Polish, Russian, Korean, Hindi
      
    

sleek

todo manager based on the todo.txt syntax for Linux, free and open-source (FOSS)

What you can do with Reminders:Set recurring remindersSchedule notificationsSort, filter, and search for remindersMark reminders as important or completeOrganize reminders using listsOptionally play a sound when notifications are sentOptionally sync with Microsoft To Do

Reminders

Some features in Sioyek:You can quickly search and open any file you have previously interacted with using sioyek.You can search and jump to table of contents entries.You can jump to any referenced figure or bibliography item even if the PDF file doesn't provide links.You can also search the names of bibliography items in google scholar/libgen by middle clicking/shif+middle clicking on their name.You can open a quick overview of figures/references/tables/etc. by right clicking on them (Like Smart Jump, this feature works even if the document doesn't provide links).Bookmarks are similar to marks except they are named by a text string and they are all global.Highlight text using different kinds of highlight, you can search among all the highlights.You can customize all key bindings and some UI elements by editing keys_user.conf and prefs_user.conf. The default configurations are in keys.conf and prefs.confSometimes when reading a document you need to go back a few pages (perhaps to view a definition or something) and quickly jump back to where you were. You can achieve this by using marks. Marks are named locations within a PDF file (each mark has a single character name for example 'a' or 'm') which you can quickly jump to using their name. In the aforementioned example, before going back to the definition you mark your location and later jump back to the mark by invoking its name. Lower case marks are local to the document and upper case marks are global (this should be very familiar to you if you have used vim).Suppose you are reading a paragraph which references a figure which is not very close to the current location. Jumping back and forth between the current paragraph and the figure can be very annoying. Using portals, you can link the paragraph's location to the figure's location. Sioyek shows the closest portal destination in a separate window (which is usually placed on a second monitor). This window is automatically updated to show the closest portal destination as the user navigates the document.Under Wayland, Sioyek will use by default the Wayland backend, if you prefer the X11 backend you can force it with: &lt;code&gt;flatpak run --nosocket=wayland --socket=x11 com.github.ahrm.sioyek&lt;/code&gt;

Sioyek

PDF viewer designed for reading research papers and technical books


      A "hierarchical spreadsheet" that is a great replacement for spreadsheets, mind mappers, outliners, PIMs, text editors and small databases.
    
      
      Suitable for any kind of data organization, such as todo lists, calendars, project management, brainstorming, organizing ideas, planning, requirements gathering, presentation of information, etc.
    
      
      It's like a spreadsheet, immediately familiar, but much more suitable for complex data because it's hierarchical. It's like a mind mapper, but more organized and compact. It's like an outliner, but in more than one dimension. It's like a text editor, but with structure.
    
    

TreeSheets


	    Nitrokey 3 is an advanced open source/open hardware USB key supporting FIDO2, an OpenPGP Card, PIV and a Password-Safe including OTPs.
      This package contains the new Nitrokey-App2, which allows accessing, updating and managing Nitrokey 3 devices.
    
    

Nitrokey App2


    Built by one of the most respected teams in the Bitcoin industry, Blockstream Green is supported across multiple platforms and is designed for Bitcoin beginners and power users alike.
    
    

Blockstream Green

A simple and secure Bitcoin and Liquid Network wallet

A task manager to help you keep track of the tasks that matter most.Sometimes, you just need a task list to keep you motivated. Agenda provides a way to write down your tasks and tick them off as you complete them. The list is saved automatically, so you can close the list to get it out of the way without losing your place.Key Features:Saves your task list automaticallySee your completed tasks until you choose to delete themAutocompletion for previously added tasksUndo/Redo with Ctrl-Z and Ctrl-YQuit with the Esc key

Agenda


      JabRef is an open-source, cross-platform citation and reference management tool. Stay on top of your literature: JabRef helps you to collect and organize sources, find the paper you need and discover the latest research.
    
    

JabRef

Graphical Java application for managing BibTeX and biblatex (.bib) databases

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