Pixelorama
Pixelorama includes layers, frame animation, palettes, tile mode, onion skinning, and sprite-sheet export for common pixel-production workflows.
Why it’s here
Its MIT license and familiar pixel workflow make it a strong open alternative to Aseprite and allow teams to extend it themselves.
Best fit
Art, animation, audio, levels, and narrative turn mechanics into a believable world.
Before you commit
Its ecosystem, plug-in count, and some advanced workflows trail Aseprite, so export settings should be validated in the target engine.