The best open source alternative to Spine is Synfig Studio, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 10 alternatives to Spine and five of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Spine are enve (Free, Open Source), Pixelesque (Free, Open Source), AnimeEffects (Free, Open Source) and Expressive Animator (Free, Open Source).
Synfig is a free and open-source, industrial-strength, vector-based 2D animation app designed for producing feature-film animations. It eliminates the need to create animations frame by frame. It is available for Windows, Linux, and macOS.
Synfig Studio vs Spine opinions
This alternative is disputed. Synfig Studio is still a legitimate alternative to Spine, but it might have issues that some users think are important.
you can't get it into games and it isn't a runtime
Negative comment • almost 2 years ago
You can't make game animations in Synfig Studio, only animation clips and animation movies
Pixelsque's goal is to be as simple as possible, while still retaining many powerful features. It works like any standard pixel art editor, with a pen, eraser, and shapes. Pinch zoom and two finger drag can be used to move around the image from anywhere.
Free and open-source software for creating amazing 2D motion graphics and vector animations. Free and open-source We believe that everyone should be free to learn and create professional designs and animations, or at least to have a chance at doing it.