https://github.com/aseprite/aseprite

C++
Animated sprite editor & pixel art tool (Windows, macOS, Linux)

Aseprite

Copyright (C) 2001-2018 David Capello

Introduction

Aseprite is a program to create animated sprites. Its main features are:

• Sprites are composed by layers & frames (as separated concepts).
• Supported color modes: RGBA, Indexed (palettes up to 256 colors), and Grayscale.
• Load/save sequence of PNG files and GIF animations (and FLC, FLI, JPG, BMP, PCX, TGA).
• Export/import animations to/from Sprite Sheets.
• Tiled drawing mode, useful to draw patterns and textures.
• Undo/Redo for every operation.
• Real-time animation preview.
• Multiple editors support.
• Pixel-art specific tools like filled Contour, Polygon, Shading mode, etc.
• Onion skinning

Issues

There is a list of Known Issues (things to be fixed or that aren't yet implemented).

If you found a bug or have a new idea/feature for the program, you can report them.

Support

You can ask for help in:

• Aseprite Community
• Aseprite Discord Server
• Official support: support@aseprite.org
• Social networks and community-driven places: Twitter, Facebook, YouTube, Google+, IRC, DeviantArt.

Authors

• David Capello davidcapello@gmail.com
  Programmer, designer, and maintainer.
  http://davidcapello.com/
• Ilija Melentijevic
  New GUI skin for Aseprite v0.8. A lot of good ideas.
  http://ilkke.blogspot.com/
  http://www.pixeljoint.com/p/9270.htm
• Contributors
  http://www.aseprite.org/contributors/

Thanks to all the people who have contributed ideas, patches, bugs report, feature requests, donations, and help me developing Aseprite.

Credits

Aseprite includes color palettes created by:

• Richard "DawnBringer" Fhager, 16 colors, 32 colors.
• Arne Niklas Jansson, 16 colors, 32 colors.
• ENDESGA Studios, EDG16 and EDG32, and other palettes
• Hyohnoo Games, mail24 palette.
• Davit Masia, matriax8c palette.
• Javier Guerrero, nyx8 palette.

It tries to replicate some pixel-art algorithms:

• RotSprite by Xenowhirl.
• Pixel perfect drawing algorithm by Sébastien Bénard and Carduus.

Aseprite uses several third-party open source projects.

License

This program is distributed under three different licenses:

1. Source code and official releases/binaries are distributed under our End-User License Agreement for Aseprite (EULA). Please check that there are modules/libraries in the source code that are distributed under the MIT license (e.g. laf, clip, she, gfx, ui, etc.).
2. You can request a special educational license in case you are a teacher in an educational institution and want to use Aseprite in your classroom (in-situ).
3. Steam releases are distributed under the terms of the Steam Subscriber Agreement.

You can get more information about Aseprite license in the FAQ.