The best open source alternative to Spriter is Synfig Studio. If that doesn't suit you, our users have ranked more than 10 alternatives to Spriter and five of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Spriter are enve, Pixel Composer, Kage Studio and SpookyGhost.
Open-source 2D software for creating animations with vector and bitmap artwork, advanced bone rigging, tweening, timeline editing, onion skinning, multi-layer effects, audio sync, and multi-format rendering on Windows, Linux, and macOS.
Enve is a free and open-source 2D animation app. It can create both vector and raster animations and even use sound and video files. It has been created with flexibility and expandability in mind.
Non-destructive node-based compositor for pixel art supporting parameter animation, batch image importing, modular and procedural workflows, real-time preview, layered editing, sprite sheet export, undo, and seamless integration into 2D game development pipelines.
Kage Studio is a vector-based 2D Animation cross-platform Software that can export animation to HTML5, PNG sequence, Spritesheet, and video (via FFmpeg) as well as static images to PNG and SVG.
SpookyGhost is a procedural animation tool for sprites made with the nCine. You can animate many different properties like the size, rotation, position, and color of your sprites, as well as deform their shape.
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Free version crash on installing