PixiEditor is AMAZING!
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PixiEditor 2.1 is a free, open-source graphics application (LGPL3) for Windows, Linux, and macOS that combines pixel art, vector graphics, digital painting, and keyframe animation in one tool. Its standout feature is a non-destructive, procedural node graph system that powers both layer effects and a new node-based brush engine introduced in version 2.1. Other recent additions include adjustment layers (blur, sharpen, smudge, brighten/darken), new custom brushes, onion skinning for animation, and sprite sheet/texture atlas export for game development. The core app is free; optional paid extensions cover advanced pixel art, skybox design, normal map creation, and 3D texture preview.