Trilium Notes is a hierarchical note-taking application with focus on building large personal knowledge bases.
      Features:
      
        Rich WYSIWYG note editing including e.g. tables, images and math with markdown autoformat
        Support for editing notes with source code, including syntax highlighting
        Notes can be arranged into arbitrarily deep tree
        A single note can be placed into multiple places in the tree (see cloning)
        Fast and easy navigation between notes, full text search and note hoisting
        Seamless note versioning
        Note attributes can be used for note organization, querying and advanced scripting
        Synchronization with self-hosted sync server
        Sharing (publishing) notes to public internet
        Strong note encryption with per-note granularity
        Relation maps and link maps for visualizing notes and their relations
        Scales well in both usability and performance upwards of 100 000 notes
        Evernote and Markdown import &amp; export
        Web Clipper for easy saving of web content
        REST API for automation
      
    

Trilium Notes


        MAME's purpose is to preserve decades of software history. As electronic technology continues to rush
        forward, MAME prevents this important "vintage" software from being lost and forgotten. This is
        achieved by documenting the hardware and how it functions. The source code to MAME serves as this documentation.
        The fact that the software is usable serves primarily to validate the accuracy of the documentation (how else
        can you prove that you have recreated the hardware faithfully?). Over time, MAME (originally stood for Multiple
        Arcade Machine Emulator) absorbed the sister-project MESS (Multi Emulator Super System), so MAME now documents a
        wide variety of (mostly vintage) computers, video game consoles and calculators, in addition to the arcade video
        games that were its initial focus.
    
    

MAME

MAME is a multi-purpose emulation framework.

Start an FTP server as user and transfer files directly via most file browsers' builtin FTP support: Windows File Explorer, Thunar, Gnome Files, Dolphin and many more!Features:User-friendly graphical interface.No root nor special permissions required.FTP encryption (FTPS). SFTP support.Single-user authentication.Optional read-only filesystem.Known upstream bugs (full list at documentation page):Gtk4 - Unresponsive UI after touch input. Gtk4 bug #5096Gtk4 - Dropdown menus not working under Steam Deck Gamescope.Flatpak - Directory selection not working under Steam Deck Gamescope.

Usermode FTP Server

The original game was remplemented with new features such as a multiplayer mode via internet as well as the support for modern hardware. It also includes some smaller upgrades that are implemented as optional addons. To do that it was necessary to rewrite the whole game, but the original graphics and sounds are still being used.Improvements towards the original game include:IP based multiplayer with optional UPnP port forwardingSupport for higher resolution including a stepless zoomA new nation: the BabyloniansNew buildings: the charcoal burnerFog of war that shrouds the area when unexploredYou will still need an original "The Settlers 2 Gold Edition" version to play Return To The Roots.

Return to the Roots

Fan project that reimplements The Settlers 2 game

A custom discord client that supports streaming with audio on Linux, made possible by the great work of @edisionnano and the Rohrkabel library by @Curve.
      Unlike a lot of other solutions, the audio here is directly fed into the screenshare and not passed to the user microphone.
      The purpose of this project is not to provide an alternative to the original Discord client. Rather, it should be used in addition to the original client in case you want to stream something, maybe used with a second account. For anything else, this client has way too many things that work less well than in the original client.
      Technically this could be against Discord's TOS, so be warned. Discord probably won't ban you for using this, but if they do I told you and it's not my fault.
      Known issues:
      
        Only works with PipeWire
        Can only share primary screen on X11
      
    

discord-screenaudio

A custom discord client that supports streaming with audio on Linux

OCR powered screen-capture tool to capture information instead of images.
      Usage:
      
        Start NormCap
        Select a region on the screen
        Wait while the text is being extracted
        Paste the result from the clipboard (ctrl+v)
      
      Some notable features:
      
        Works offline (data doesn't leave your computer)
        Supports many different languages
        Supports multi monitor setups
        Heuristic parsing to improve results
        Free and Open Source
        Available for Linux, Windows and macOS
      
      Tags: OCR, Tesseract, screenshot, recognition
    

NormCap

AM2R (Another Metroid 2 Remake) is a fan-made remake of &lt;em&gt;Metroid II: Return of Samus&lt;/em&gt; in the style of &lt;em&gt;Metroid: Zero Mission&lt;/em&gt;. It was released in 2016 by DoctorM64 and his team, and very soon after, has received a DMCA letter from Nintendo. A few years after, multiple members of the community managed to reverse engineer the game and published unofficial updates, dubbed the AM2R-Community-Updates. Those fixed bugs and added new features like widescreen, added content planned by the original devs before they were struck down, and ported it to other platforms.The AM2RLauncher lets you conveniently play those Community-Updates, automatically receive updates, install AM2R mods and create APKs to play on your phone. No copyrighted files are shipped, you need to provide your own copy of AM2R_11!For further questions regarding AM2R . For further questions regarding the AM2RLauncher . For further communication, you can reach us on , , or .

AM2RLauncher

A front-end for dealing with AM2R updates and mods

Contour is a modern and actually fast, modal, virtual terminal emulator, for everyday use. It is aiming for power users with a modern feature mindset.Available on all 4 major platforms, Linux, OS/X, FreeBSD, Windows.GPU-accelerated rendering.Font ligatures support (such as in Fira Code).Unicode: Emoji support (-: 🌈 💝 😛 👪 - including ZWJ, VS15, VS16 emoji :-)Unicode: Grapheme cluster supportBold and italic fontsHigh-DPI support.Vertical Line Markers (quickly jump to markers in your history!)Vi-like input modes for improved selection and copy'n'paste experience and Vi-like scrolloff feature.Blurred behind transparent background when using Windows 10 or KDE window manager on Linux.Blurrable Background image support.Runtime configuration reload256-color and Truecolor supportKey binding customizationColor SchemesProfiles (grouped customization of: color scheme, login shell, and related behaviours)Synchronized renderingText reflow (configurable via SM ? 2028 / RM ? 2028)Clickable hyperlinks via OSC 8Clipboard setting via OSC 52Sixel inline imagesTerminal page buffer capture VT extensionBuiltin Fira Code inspired progress bar support.Read-only mode, protecting against accidental user-input to the running application, such as Ctrl+C.VT320 Host-programmable and Indicator status line support.and much more ...

Contour Terminal Emulator

Contour is a modern and actually fast, modal, virtual terminal emulator, for everyday use

SysDVR-Qt is a tiny GUI wrapper for SysDVR-Client.
      To use this you need to setup SysDVR on your console first, see the guide for more information.
    

SysDVR-Qt

Stream Switch games to your PC via USB or network


      SDRangel is an Open Source SDR and signal analyzer frontend to various hardware. It is able to receive and transmit various analog and digital modes,
      TX/RX from multiple SDRs simultaneously, do noise figure measurement, satellite and star tracking, rotator control, 2D and 3D mapping and much more.
    
      
      It has native support for Airspy, Airspy HF, Airspy Discovery, FUNcube, HackRF, KiwiSDR, LimeSDR, LimeSDR Mini, LimeRFE, Perseus, PlutoSDR,
      RTL-SDR, USRP B210, XTRX, and more devices via Soapy and audio interfaces.
    
      
      Please note that the SDRangel Flatpak requires udev rules for most SDR devices to be installed on the system to work properly.
      You will have to either install the tools for your SDR via regular package manager or manually download the udev rules from
      github.com/flathub/org.sdrangel.SDRangel/tree/master/udev-rules and copy them into system /etc/udev/rules.d/
      before using SDRangel.
    
    

SDRangel


            86Box is a hypervisor and IBM PC system emulator that specializes
            in running old operating systems and software designed for IBM
            PC systems and compatibles from 1981 through fairly recent
            system designs based on the PCI bus.

            It supports various models of PCs, graphics and sound
            cards, and CPUs.
        
      
            To use 86Box you will need to dump BIOS ROMs for each machine you
            want to emulate.
        
    

86Box

Tuxemon is a free, open source monster-fighting RPG. It's in constant development and improving all the time! Contributors of all skill levels are welcome to join.Features:Game data is all json, easy to modify and extendGame maps are created using the Tiled Map EditorSimple game script to write the storyDialogs, interactions on map, npc scriptingLocalized in several languagesSeamless keyboard, mouse, and gamepad inputAnimated mapsLots of documentationPython code can be modified without a compilerCLI interface for live game debuggingRuns on Windows, Linux, OS X, and some support on Android183 monsters with sprites98 techniques to use in battle221 NPC sprites18 items

Tuxemon

Tuxemon is a free, open source monster-fighting RPG.

Simple app to scan QR codes on screen and from camera, the result is in your clipboard.

ClipQR

Calculate the position of the sun, moon, and milky way to plan the perfect time to take a picture.People who love to photograph know, that the biggest problem is being at the right spot at the right time. Therefore, landscape pictures should be planned before visiting the place of choice. To plan the location it is important to know the position of the sun, moon, and sometimes also the milky way. Where to find the sun at which time is most of the time easy to guess but when is the sunset? And for the milky way normally nobody knows where to find it in the night sky at which time at a specific location. This small program should answer all these questions.

PicPlanner

unlockR is a simple app to unlock / decrypt PDF files.

unlockR

BeeRef lets you quickly arrange your reference images and view them while you create. Its minimal interface is designed not to get in the way of your creative process. Drag 'n drop functionality does not currently work from all sources in the Flatpak release.

BeeRef

LPairs2 is a classic memory game where you turn over any two cards and if they match they get removed. The game is over when all cards have been matched. You can also try to match triplets and quadruplets (fun, but hard...).There is also a 2-player mode with a CPU opponent.Cards are high resolution animal pictures.

LPairs2

Solve the riddle until you run out of guesses!The game is a clone of Wordle and made with localization in mind.

Blurble


      A translation app for GNOME.
    
      
      Features:
    
      
        Translation based on Google Translate
        Translation based on the LibreTranslate API, allowing you to use any public instance
        Translation based on Lingva Translate API
        Translation based on Bing
        Translation based on Yandex
        Text to speech
        Translation history
        Automatic language detection
        Clipboard buttons
      
    

Dialect

What is Retrodeck?
      RetroDECK is an emulation and retro gaming solution to catalog and play your game collection directly from Linux in one unified application.
  It's inspired by other embedded emulation systems like AmberELEC, EmuELEC, CoreELEC, Lakka, and Batocera.
  RetroDECK is powered by EmulationStation Desktop Edition, that uses RetroArch and other standalone emulators to allow you to import and play your favorite games in a tidy environment.
  No other software is needed as everything it's already included in one package!
      BETA NOTICE: RetroDECK is still in Beta and the team is actively developing and adding more features.
         The primary focus during the beta period is on SteamOS and the Steam Deck but we hope to expand to more devices and general Linux desktop in the future
      NOTE: It can be run on Linux desktop right now but there will be some manual configurations needed for input, storage location and other tiny hickups.
      
         INSTALLATION INSTRUCTIONS FOR THE STEAM DECK:
            1. Start RetroDECK from the Desktop mode (only needed for the initial first time configuration)
            2. Add RetroDECK to your Steam Library by pressing "Add a non-steam game to my library"
            3. Download the offical RetroDECK controller profile from Steam
            4. [OPTIONAL] Download Steam Grids graphics for RetroDECK with BoilR
      
      For more detailed information check our wiki: 
      https://github.com/XargonWan/RetroDECK/wiki
      If you want to sponsor the project: 
      https://www.patreon.com/RetroDECK
      If you want to join the RetroDECK community check our:
      Reddit: https://www.reddit.com/r/RetroDECK/
      Discord: https://discord.gg/Dz3szYsP8g 
         (If you want to help out with the project join the "i-want-to-help" channel)
    

RetroDECK

RetroDECK brings an environment to catalog and play your retro games directly on your Steam Deck


          InfiniteShooter is a simplistic shooter game made with Godot. There's only one goal: survive for as long as possible.
        
      
          The controls are easy to understand too. All you need to know is how to move your ship and fire a laser.
          Using these controls, you can experience InfiniteShooter's simple yet addicting gameplay--which might have you playing for longer than you should!
        
      
          As the game progresses, more enemy types will be introduced and game mechanics may even change.
          However, when you die, your score is logged and all progress is reset!
        
      
          Lastly, this game is fully free-and-open-source, in both meanings of free!
          Not only are all the assets public domain with CC-0 licenses, but the game itself is licensed under the GNU GPL v3, meaning you're free to modify and help improve the source code of the game.
          There's no in-app purchases and no cheap tricks. When you get the game, you get the whole game, for free. 
        
    

InfiniteShooter

A simplistic shooter made with the Godot engine.

The screen will flash for a certain time less than a second, and then you guess how long it was. As you play, you'll get better at identifying these sub-second time intervals.

Timing Trainer - Learn this skill!

Learn to identify sub-second timing intervals

This is a thought-experiment app based around the idea of having a terminal emulator running in a separate container from the session inside of it, with the kernel as the only intermediary.This is accomplished by means of file descriptor passing of the pseudo-terminal device from a small "agent" program running on the other side of a container boundary.  The agent is started using the usual container tools (flatpak-spawn, toolbox, podman), but creating a session is done purely via sockets.Boxi uses different application identifiers when it is run for different containers.  This allows creating individual launcher icons for each container.

Boxi

GNU PSPP is a program for the statistical analysis of sampled data. It is a Free replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions. The most important of these exceptions are, that there are no “time bombs”; your copy of PSPP will not “expire” or deliberately stop working in the future. Neither are there any artificial limits on the number of cases or variables which you can use. There are no additional packages to purchase in order to get “advanced” functions; all functionality that PSPP currently supports is in the core package.
      PSPP is a stable and reliable application. It can perform descriptive statistics, T-tests, anova, linear and logistic regression, measures of association, cluster analysis, reliability and factor analysis, non-parametric tests and more. Its backend is designed to perform its analyses as fast as possible, regardless of the size of the input data. You can use PSPP with its graphical interface or the more traditional syntax commands.
      A brief list of some of PSPP's features.
      
        Support for over 1 billion cases
        Support for over 1 billion variables
        Syntax and data files which are compatible with those of SPSS
        A choice of terminal or graphical user interface
        A choice of text, postscript, pdf, opendocument, html or TeX output formats
        Inter-operability with: LibreOffice, Apache OpenOffice, Gnumeric and other free software
        Easy data import from spreadsheets, text files and database sources
        The capability to open, analyse and edit two or more datasets concurrently
        A user interface supporting all common character sets
        The user interface has been translated to multiple languages
        Very fast statistical procedures, even on very large data sets
        No license fees and no expiration period
        No unethical “end user license agreements”
        A fully indexed user manual
        Freedom ensured; It is licensed under the GPLv3 or later
        Portability; Runs on many different computers and many different operating systems
      
      PSPP is particularly aimed at statisticians, social scientists and students requiring fast convenient analysis of sampled data.
      The Flatpak for PSPP includes graphical and command-line interfaces.  To use the command-line interface, run: flatpak run --command=pspp org.gnu.pspp.
    

GNU PSPP

GNU PSPP is a program for statistical analysis of sampled data

SolveSpace is a free (GPLv3) parametric 3d CAD tool. Applications include:Modeling 3d parts — draw with extrudes, revolves/helix, and Boolean operationsModeling 2d parts — draw the part as a single section, and export; use 3d assembly to verify fitModeling 3d-printed parts — export the STL or other triangle mesh expected by most slicersPreparing 2D CAM data — export 2d vector art for a waterjet machine or laser cutterMechanism design — use the constraint solver to simulate planar or spatial linkagesPlane and solid geometry — replace hand-solved trigonometry with a live dimensioned drawing

SolveSpace

Fityk [fi:tik] is a program for data processing and nonlinear curve fitting.
      Primarily used:
      
        by scientists who analyse data from powder diffraction, chromatography, photoluminescence and photoelectron spectroscopy, infrared and Raman spectroscopy, and other experimental techniques,
        to fit peaks – bell-shaped functions (Gaussian, Lorentzian, Voigt, Pearson VII, bifurcated Gaussian, EMG, Doniach-Sunjic, etc.),
      
      but it is suitable for fitting any curve to 2D (x,y) data.
    

Fityk


      Flare is an unofficial app for Signal. It is still in development and doesn't include all the features that the official Signal apps do. More information can be found on its feature roadmap.
    
      
      Please note that using this application will probably worsen your security compared to using official Signal applications.
      Use with care when handling sensitive data.
      Look at the projects README for more information about security.
    
    

Flare

This app allows to use the Fava and Beancount double-entry bookkeeping software packages as a GNOME desktop application.Easy installation using flatpakStart fava and beancount as you would any other desktop application.Built as a GNOME application, using GTK4 and webkit, packaged using flatpak.

Fava

Do your finances using fava and beancount

A 2-D freeform space mystery game featuring exploration, trading, and combat mechanics similar to games like Endless Sky and Starsector, and a branching mystery storyline written in a manner inspired by works like Star Control 2 (The Ur-Quan Masters) and The Expanse.
      You assume control of a space ship and are free to advance thru the game however you want. Uncover the cause of the mysterious Incident, discover the source of the pirate scourge, or make your own way in the galaxy. In the eye of the storm that is chaos, there is great opportunity.
    

Naikari: Eye of Chaos

Tennix is a overhead view tennis simulator for one or two players. It features locations from all 4 Grand Slam tournaments in Australia, France, the USA and England.

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