Pixelorama
A free & open-source 2D sprite editor, made with the Godot Engine
... timeline just for you! You can work at an individual cel level, where each cel refers to a unique layer and frame. Supports onion skinning, cel linking, motion drawing and frame grouping with tags. Custom brushes, including random brushes. Create or import custom palettes. Import images and edit them inside Pixelorama. If you import multiple files, they will be added as individual animation frames. Importing sprite sheets is also supported.