OpenSCAD is a software for creating solid 3D CAD models. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies.
      OpenSCAD is not an interactive modeller. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters.
      OpenSCAD provides two main modelling techniques: First there is constructive solid geometry (aka CSG) and second there is extrusion of 2D outlines. As data exchange format for this 2D outlines Autocad DXF files are used. In addition to 2D paths for extrusion it is also possible to read design parameters from DXF files. Besides DXF files OpenSCAD can read and create 3D models in the STL and OFF file formats.
    

OpenSCAD

LeoCAD is a CAD program for creating virtual LEGO models. It's available for free under the GNU Public License v2 and works on the Windows, Linux and macOS Operating Systems.
    

LeoCAD

Design virtual models you can build with LEGO bricks

qView is a Qt image viewer designed with minimalism and usability in mind. It is designed to get out of your way and let you view your image without excess GUI elements, while also being flexible enough for everyday use.

qView

CloudCompare is a 3D point cloud (and triangular mesh) processing software. It has been originally designed to perform comparison between two dense 3D points clouds (such as the ones acquired with a laser scanner) or between a point cloud and a triangular mesh. It relies on a specific octree structure dedicated to this task.  Afterwards, it has been extended to a more generic point cloud processing software, including many advanced algorithms (registration, resampling, color/normal/scalar fields handling, statistics computation, sensor management, interactive or automatic segmentation, display enhancement, etc.).
    

CloudCompare


           MeshLab is a free and open source processing and editing 3D triangular meshes.
           It provides a set of tools for editing, cleaning, healing, inspecting,
           rendering, texturing and converting meshes. It offers features for processing
           raw data produced by 3D digitization tools/devices and for preparing models
           for 3D printing.
        
    

MeshLab

Free and open source processing and editing 3D triangular meshes


            Blockbench is a free, modern model editor for low-poly and boxy
            models with pixel art textures. Models can be exported into
            standardized formats, to be shared, rendered, 3D-printed, or used
            in game engines. There are also multiple dedicated formats for
            Minecraft Java and Bedrock Edition with format-specific features.
        
      
            Blockbench features a modern and intuitive UI, plugin support and
            innovative features. It is the industry standard for creating
            custom 3D models for the Minecraft Marketplace.
        
    

Blockbench


      Tux Paint is a free, award-winning drawing program for children ages 3 to
      12.
      Tux Paint is used in schools around the world as a computer literacy
      drawing activity.
      It combines an easy-to-use interface, fun sound effects, and an
      encouraging cartoon mascot who guides children as they use the program.
    
      
      Kids are presented with a blank canvas and a variety of drawing tools to
      help them be creative.
    
    

Tux Paint

Natron is a free open-source (GPLv2 license) video compositing software, similar in functionality to Adobe After Effects, Nuke by The Foundry, or Blackmagic Fusion.

Natron

This is an effort to bring quick, simple but powerful image editing to the masses. PhotoFlare is inspired by the image editor currently only available on Microsoft Windows – PhotoFiltre. However, it will not be a straight clone. It is being built from the ground up to be much improved and cross platform too!Features:Easy quick cropping tool.Flip, Rotate and scale images.Lots of unique image filters.Batch processing tool with support for all editor features.Multiple translations are supported.

Photoflare

Simple but powerful Cross Platform Image Editor


        Converseen is a free cross-platform batch image processor that allows you to convert,
        resize, rotate and flip an infinite number of images with a mouse click.
        Moreover, Converseen is able to transform an entire PDF file into a bunch of images
        with the characteristics you prefer: you can choose one of the 100+ formats,
        you can set the size, resolution and the filename.
    
      What can I do with Converseen.
      
        Carry out a single or a multiple conversion
        Resize one or multiple images
        Compress images for your web pages
        Rotate and flip images
        Rename a bunch of images using a progressive number or a prefix/suffix
        Selecting a resampling filter to resize images
        Convert an entire PDF to a bunch of images
        Extract an image from a Windows icon file (*ico)
      
    

Converseen

MyPaint is a fast, free, and easy graphics app for digital painters. It lets you focus on the art you make instead of the program you make it with. You can work on your canvas without clutter, and show the interface only when you need it. MyPaint works best with a graphics tablet.MyPaint’s brush engine is fast and almost infinitely configurable to simulate many natural media brushes or experimental ‘unrealistic’ ones. It ships with a variety of pre-made brushes by prominent artists, so you don’t have to configure your own if you don’t want to.

MyPaint

A program for comparing multiple versions of an image or video.

Identity


            Read, browse and manage your comics collection.
            All you need to enjoy your digital comics.
        
      
            Browse your comics collections using beautiful, customizable and smooth "comic flow"
            transitions.
        
      Features:
      
        File support: YACReader supports a wide variety of comic files and image types. rar,
                zip, cbr, cbz, tar, pdf, 7z and cb7, jpeg, gif, png, tiff and bmp.
        Configure your reading: Image rotation, double page mode, full size view, fullscreen
                mode, customizable background color, custom page fitting mode, bookmarks, resume
                reading, eye candy 'go to' and more.
        Image improvements: Bring to life your old comics with the image adjustments
                available in the reading mode. Use the brightness, contrast and gamma sliders and
                enjoy the new vibrant colors.
        Track your readings: YACReaderLibrary organizes your comics and keeps track of your
                reading progress and your collections' status.
        Tags (comic vine): Download your comics' information from Comic Vine. Title, number,
                volumen, authors and more.
        Search: Find your comics quickly using the built-in search engine. No matter how big
                is your collection, YACReaderLibrary will find anything instantly.
      
    

YACReader

Photos

MComix is a user-friendly, customizable image viewer. It is specifically designed to handle comic books (both Western comics and manga) and supports a variety of container formats (including CBR, CBZ, CB7, CBT, LHA and PDF).MComix is a fork of the Comix project, and aims to add bug fixes and stability improvements after Comix development came to a halt in late 2009.

MComix


      This software provides applications to easily turn hard-copy
      documents and imagery into formats that are more amenable to
      computer processing.
    
      
      This software only works with Epson scanners.
    
    

Image Scan


      Lunacy is the ultimate graphic design editor for UX/UI, and Web. It combines the best features of all the designer apps to help you optimize your workflow and minimize distractions. Take advantage of the built-in graphics library, use powerful AI tools, and collaborate on projects with your team on several platforms simultaneously!
    
      Let’s take a look at what’s inside:
      
        Real-time collaboration with comments, stickers, and audio messages
        1 500 000 icons, photos, and illustrations
        AI routine killers: BG remover, image upscaler, text and avatar generators
        Figma &amp; Sketch support
        Cloud storage
        Private offline mode
        Low system requirements
        25 supported languages
      
      And much more!
      Don’t forget to join our growing designer community!
    

Lunacy

Copy Text from Images with ease, Perform OCR operations in seconds.

TextSnatcher

Skanpage is a simple scanning application optimized for multi-page document scanning. It can also scan and save single-page documents and images.
      Features:
      
        Scanning from flatbed and ADF scanners
        Configurable options for scanning device
        Reordering, rotation, and deletion of scanned pages
        Saving to multi-page PDF documents and image files
      
    

Skanpage


            Saber is the notes app built for handwriting.
        
      
            It's designed to be as simple and intuitive as possible, while still delivering unique features that you'll actually use. Additionally, Saber is available across all your devices, large and small, and syncs between them seamlessly.
        
      
            Notably, it can invert your notes when you're in dark mode. This allows you to write with white ink on a black background, which is much easier on the eyes in low-light environments like when the teacher turns off the lights in class.
            Images and PDFs are also inverted, so you can still use a digital printout or a textbook without the fuss.
        
      
            Saber uses a dual-password system to protect your notes from anyone but you, even if they have complete control over the server. You can safely store your notes on the official Saber server, another server, or even host your own!
        
      
            The app is completely open-source so that anyone can view the source code and see exactly what it's doing and how it handles your data. Many other note-taking apps are closed-source and proprietary, meaning that their inner workings are a mystery to the public.
        
      
            As someone who studies maths, highlighting multi-line equations was always a hassle with other apps, where the highlighter would change color when it overlapped with itself. Another problem I had was that in some apps, the highlighter would render on top of the text, fading it out and making it hard to read.
            Saber's highlighter has no such issues. It utilizes canvas compositing to render the highlighter in a way that is consistent with/better than traditional paper, where it handles overlaps and maintains color consistency.
        
      
            Saber has everything you need to keep your notes organized. Create folders inside folders inside folders to your heart's content with no limit on the number of nested folders. And even though a note may be buried deep within a nested folder, you can still access it easily with your most recent notes always available on the home screen.
        
      
            Discover a whole new way to capture and organize your thoughts
            with Saber. Whether you're a student, professional, or creative
            mind, Saber is your trusted companion for digital handwriting.
            Download now and let your ideas flow freely!
        
    

Saber: Handwritten Notes

A cross-platform ship-borne GUI navigation application made up by a core program, a large set of plugins and freely available charts.  The application is configurable with user icon. The core supports:GPS/GPDS Position Input and DisplayBSB Raster Chart displayS57 Vector ENC and CM93 chart displayAIS Input Decoding and DisplayWaypoint Autopilot NavigationPlugin support includes wheather, tactical, annotations and tidal data. Pilot charts can be downloaded from project website at opencpn.org. Other useful add-ons may be found inside the "Download" link at at the same site.

OpenCPN

A concise Chartplotter and Navigation software

hugin can be used to stitch multiple images together. The resulting image can span 360 degrees. Another common use is the creation of very high resolution pictures by combining multiple images. It uses the Panorama Tools as back-end to create high quality images Command-line tools are available to generate panoramic images and to batch-process hugin projects.Examples of what you can do with hugin:Stitch and blend multiple rows of overlapping images shot from the one locationStitch and blend multiple overlapping images of a plane surface shot from multiple locationsStitch and blend flat scanned imagesCorrect perspective, vignetting, exposure and white balance

hugin

gImageReader is a simple optical character recognition (OCR) application which acts as a frontend to the tesseract OCR engine. Features include:Import PDF documents and images from disk, scanning devices, clipboard and screenshotsProcess multiple images and documents in one goDefine, manually or automatically, the recognition areaRecognize and export as plain text or as hOCR documentsRecognize text next to imagesPost-processing recognized text, including spell checkingGenerate PDF/ODT documents from hOCR documents

gImageReader

A graphical (gtk) frontend to tesseract-ocr

A missing native QR Code and barcode scanner application for Linux desktop.
      CoBang can scan barcode, QR code from webcam or from static image.
 To be part of Linux desktop modernization, it is set to support Wayland (not XWayland), and only implement native GUI (no web crap).
    

CoBang

jExifToolGUI is a java/Swing Windows/Linux/MacOS graphical frontend for the excellent command-line application called ExifTool by Phil Harvey.ExifTool is a platform-independent Perl command-line application and library for reading, writing and editing meta information in a wide variety of files. Exiftool is by far the best and most extensive metadata tool available! It reads and writes metadata information from/to many files, but primarily focuses on photos/images. It reads/writes exif, gps, xmp, maker notes for many cameras, JFIF, GeoTIFF, ICC Profile, Photoshop IRB, FlashPix and many, many more tags. It can use a "reference" image to write the tags to a multiple set of photos or a complete directory containing photos. Author/creator/maintainer of ExifTool: Phil Harvey.jExifToolGui is a java/Swing program that functions as a graphical frontend (GUI) for exiftool. Many thanks go to Phil Harvey for his excellent tool. Without ExifTool, this jExifToolGui Graphical frontend for ExifTool would never have existed.jExifToolGui is (just) a graphical frontend for ExifTool. It can use a "reference" image to write the tags to a multiple set of photos, like gps tags for photos that were taken at the same location but somehow miss or contain the incorrect gps info. jExifToolGUI also contains extensive renaming functionality based on the exif info in your photos. This jExifToolGUI program is free, Open Source software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

jExifToolGUI

Geeqie is a lightweight image viewer for Linux, BSDs and compatibles. It can be used as a simple, fast, database-free image viewer, but equally it can be used to manage large collections of images.
      Geeqie is an image viewer that makes navigation of images easy. Images can be viewed as thumbnails, in multiple windows or in full screen mode. Geeqie is an image manager, with complete copy, move, rename, and delete functions available at the press of a button. Extensive image collections can be easily handled using a combination of Geeqie's flexible Keyword facility and powerful Image searches.
      Image collections can be refined with a duplicate image finder. Geeqie is ideal for making presentations. A slide-show feature is built in, and Geeqie can be remotely controlled either via command line scripts. Information such as f-stop, shutter speed and descriptive text can be overlaid onto the image display. There is no need to import images into Geeqie - simply point Geeqie to a folder containing images, and your data will be displayed.
    

Geeqie


      Create small, searchable PDFs from scanned documents.
      The program divides images into bitonal foreground images (text)
      and a color background image, then compresses them separately.
      An invisible OCR text layer is added, making the PDF searchable.
    
      
      Color and grayscale scans need some preparation for good results.
      Recommended tools are Scan Tailor or GIMP.
    
      
      A GUI and command line interface are included.
    
    

Scans to PDF

Create small, searchable PDFs from scanned documents

PhotoQt is a fast and simple, good looking, yet powerful and highly configureable image viewer.
      It provides an uncluttered interface and can be extensively tweaked to fit ones needs perfectly. It is possible to set key or mouse shortcuts for many of its features and capabilities, as well as for any external script/command.
      It supports loading 100+ image formats, video files, and documents. Additionally, it fully supports Google Motion Photos, Apple Live Photos, and photo spheres (including 360 degree panoramas).
      The many features provided include: thumbnails, slideshow, color profiles, chromecast, zooming, rotating, flipping, displaying metadata (selection of Exif and IPTC), set-as-wallpaper, simple file management, scaling, face tags (XMP metadata), touchscreen support, and a lot more.
    

PhotoQt

jPDF Tweak is a Java Swing application that can combine, split, rotate, reorder, watermark, encrypt, sign, and otherwise tweak PDF files.

jPDF Tweak

This app lets you draw diagrams, tables, tree view, art and more using only characters.
There are many stiles to choose from and multiple tools available to use such as:
      
        Rectangle
        Filled Rectangle
        Cartesian, freehand and stepped line
        Freehand Brush
        Text with FIGlet fonts
        Table
        Tree View
        Eraser
        Character Picker
        Select and move
      
    

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