S&box is a platform and game development toolkit developed by Facepunch studio powered by Source 2. Initially, the development was based on Unreal Engine 4, but as soon as Half-Life: Alyx came out, Facepunch immediately requested the engine branch of the newly-published game.

Professional-ready sketch and painting software with animation capabilities.

For user from PaintTool SAI, Adobe Photoshop, MediBang Paint, ibis Paint X, or SketchBook, this software have anything you need.

If you're Clip Studio Paint user, it lacks a lot of unique feature that CSP have. (Especially if you come from professional Japanese manga/animation production pipeline). Potential CSP features addition such as comic creation utilities (both book and webtoon layout) and sub-tooling are still in dicussion. Krita also does not have flexible windowing system to work on multiple artwork (I already made feature request for this).

For Expresii and Rebelle users, there's no realistic water paint emulation yet.

For openCanvas user, go use Clip Studio Paint instead (for now, it's paid tho).

Alternative to Live2D Cubism software suite, for creating live animated character, the one that usually featured in Japanese visual novel (especially galge) and Virtual Youtuber.

Still not as capable to match existing industry standard (still in early development stage). Only recommended if you're merely using it for indie games or Vtuber character.

They also have active Japanese contributors, so it might not too far from what Japanese ACG industry needs.

The dev recently changed their software from free to freemium, as they want to fund the development. It cost 20USD, but you can still "evaluate" it for free with 10 seconds reminder screen at startup.

Image editor software. If you ever tried GIMP five or ten years ago, it might be the best time to revisit GIMP, as it has tons of improvement.

While the software itself is powerful, it requires a little bit of learning, especially if you're coming from Adobe Photoshop, Affinity Photo, or Pixelmator.

GIMP 3.0 forward brings a lot of new features and improvement, after more than 10 years of fixing underlying base to be more future proof. Notably: shape tools.

List of supported image format: https://testing.developer.gimp.org/core/standards/images/ (incomplete?)

Pixel art creation software. Also suitable to create sprite, game asset, or pixel animation. Good alternative to paid software like Aseprite.

It's not 1-to-1 feature parity, but it has a lot of unique features.

Animation creation software. Specialized for Japanese 2D anime industry pipeline. Used by Studio Ghibli.

It lacks a lot of QoL improvements you expect from 2D modern animation software. Its fork: Tahoma2D tried to fix this.

3D creation software suites. Also capable to do video editor and 2D animation, though not as powerful as other specialized software.

It might not be the software used in (several) already established animation, movie, or game development (looking at you, Autodesk Maya), but it become the new standard for newer studio as they are able to start a new production pipeline.

Vector-based document/image creation software with (sometimes) better feature implementation than existing proprietary alternative. Easy to pick up and learn.

Choose this over Adobe Illustrator if you're beginner. To note: Affinity Designer has several unique feature that even any industry standard don't have (I think), but the dev also seems keen to replicate some features from it and other competitor.

Node-based raster and vector software. Built as multi-platform (including web) with Rust. Currently in alpha.

This developer is attempting to make software caters to graphic design, motion graphics, image editing, digital painting, VFX compositing, page layout and printing.

Roadmap: https://graphite.rs/features/#roadmap

User interface (UI) designer software with collaboration feature. Alternative to Figma and Sketch

Desktop publishing software. Good enough for professional usage, but lacking a lot of modern feature and user experience compared to alternative like Adobe InDesign or Affinity Publisher

If you just want to replace Microsoft Publisher, that might be enough.

Advanced voxel creation software. Alternative of Avoyd and Qubicle Voxel Editor

Basic voxel creation software. MagicaVoxel alternative.

Just like MagicaVoxel, this one is relatively easy to use that even children can use it like a toy.

Though, MV has better interface, and it's also free (though not open source) ...

Basic image editing utility.

Originally clone of Paint.NET, now evolved into more modern version.

Collaborative drawing software.

It's suitable for professional tools or community drawing.

Roadmap: https://media.ccc.de/v/lgm25-upstream-2025-83646-state-of-libre-graphics (LGM 2025 event, minute 09:44)

General purpose graphic software, combining raster, vector, and pixel art with node graph support.

Not as powerful as Pixel Composer yet in terms of pixel art node graph. Might be a close competitor to PixelOver as well (?)

Oriedita is a computer program used for drawing origami crease patterns. It comes with a wide range of tools to help you draw crease patterns.

Fontforge is a free Typeface (font) editor program for Windows, Mac OS X and GNU+Linux and is localized in several languages.

Draw lets you produce anything from a quick sketch to a complex plan, and gives you the means to communicate with graphics and diagrams. With a maximum page size of 300cm by 300cm, Draw is a an excellent package for producing technical drawings, general posters, and much else.

Adobe Flash-alike animation and game development software.

Fork of Wick Editor It was inspired by Scratch, so they based on design as easy-to-use as possible. Even for the children.

Alternative to SketchBook

In my opinion, this software can be developed to be more of Rebelle and Expresii , as it has user interface that serve similar audience.

Work in progress.

The developer is inspired from PaintTool SAI and MediBang Paint

PaintTool SAI clone for Linux.

If Krita and GIMP feels too bloated, while MyPaint is too basic, use this one.

Node-based painting tools with experimental UI.

Simple and distraction free storyboarding software.

Lightweight online drawing tools, can be self-hosted.

InfiniPaint is a collaborative, infinite space, infinite zoom, canvas note-taking/drawing app. Unlike many other infinite canvas apps, although there is a specific zoom-in level limit, there is no zoom-out limit (at least up until the point your computer runs out of memory).

Vector animation and motion design desktop application, with LottieFiles format support.

General motion graphic and web animation software. Fork of discontinued enve with active contribution and modern UI.

Boats Animator is a free and open-source stop motion animation program for Windows, macOS and Linux. Its intuitive interface caters to animators of all levels and offers many powerful features. The program has been open sourced under the GNU General Public License and...

Interactive open source tool for creating fully customizable 3D human characters, supporting real-time editing, advanced posing, and export to major animation platforms.

Meshroom is a free, open-source 3D Reconstruction Software based on the AliceVision Photogrammetric Computer Vision framework.

Adobe Substance Designer alternative (?)

Wings 3D is a subdivision modeler inspired by Nendo and Mirai from Izware.

It is possible to assign materials, vertex color, UV coordinates and textures, but there will be improvements in those features before Wings goes 1.0.

There is no support in Wings for doing animations.

General 3D CAD software.

I don't really use other commercial alternative, so I cannot properly compare them. But it definitely works for various task, from architecture, machinery, to 3D printing.

Defintiely not a one-to-one SketchUp alternative, as this software has more extensive interface and tools.

Intended for "planar slice 2D cut" stuff (I don't know whether there's actual term for it).

LibreCAD is an open source 2D CAD application for Windows, Apple and Linux. It is based on Qt, which is a leading cross-platform application and UI development framework.

KiCad is an open source software suite for electronic design automation (EDA) - designing schematics of electronic circuits and printed circuit boards (PCB). KiCad is developed by Jean-Pierre Charras. And features an integrated environment between schematic capture, bill of...

Advanced digital photo management software with features to organize, tag, compare, and process photo collections, supporting multiple formats including RAW.

Powerful cross-platform raw photo processing software offering advanced user control over demosaicing and development. Supports HDR DNGs and image formats.

Open source non-destructive RAW photo editor and image database with lighttable and darkroom views, real-time editing, HDR and scientific image support.

VOCALOID alternative, but don't expect the same voicebank, like Hatsune Miku or Po-uta.

Just in case you don't know what is Vocaloid, it's basically a voice synthetizer software.

There's also another FOSS voice sythetizer (talk only, no singing) called VOICEVOX. This one is Japanese only, but it has popular Zundamon official voice bank! https://github.com/VOICEVOX/voicevox

Powerful subtitling software, used by amateur and professional. Probably the most used software in fansubbing scene. Some company like Crunchyroll or Muse Asia are actually using this software.