The best open source alternative to Synfig Studio is Krita. If that doesn't suit you, our users have ranked more than 50 alternatives to Synfig Studio and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Synfig Studio are OpenToonz, Glaxnimate, Pencil2D and Candlestick.
Free, open-source painting software designed by artists for artists. Offers customizable UI, 9 brush engines, color management, tablet support, non-destructive editing, and privacy features. Portable and available on major platforms, supporting seamless texture creation.
Open-source 2D animation software supporting raster and vector workflows, node-based compositing, plug-in extensions, anti-aliased painting, and support for major platforms, developed in collaboration with Studio Ghibli and suitable for commercial projects.
Open-source animation software focused on simple, fast creation of vector graphics, supporting short web animations and exporting to GIF, SVG, WebP, Lottie, and more for web compatibility. Designed for ease of use across major platforms.
Pencil2D is an opensource animation/drawing software for Mac OS X, Windows, and Linux, based on old Pencil software. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics.
Open-source editor runs in browser for making games, animations, and interactive content, offering vector drawing, timeline tools, asset import/export, JavaScript scripting, onion-skinning, plug-ins, and no installation or feature restrictions required.
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.
Inochi creator is a framework for realtime 2D puppet animation. On this site you can find the reference implementation as well as the official tooling for creating and using Inochi2D puppets for VTubing.
Tahoma2D is a powerful program for 2D and stop motion animation. Tahoma 2D is based on OpenToonz.
OpenToonz is based on software "Toonz" which was developed by Digital Video S.p.A. in Italy,
Open-source 2D animation software offering a modular, beginner-friendly interface, real-time preview, vector illustration in beta, timeline and exposure sheet features, cross-platform support, and export options for OGV, AVI, MPEG, SWF, and PNG image arrays.
Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics.
AnimeEffects is a 2D keyframe animation tool based on deformation of polygon meshes. You can easily operate, quickly shape your idea, and remake at any time if you have changed your mind.
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Synfig does vector graphics. Krita does raster. If someone's looking for something like Synfig, they want vector graphics.