Spirit - The animation tool for the web.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
CopyQ - CopyQ : Clipboard Manager with Advanced Features.
Synfig Studio - Just another WordPress site
GSAP - GSAP (GreenSock Animation Platform) is a suite of JavaScript tools for high-performance animations that work in all major browsers.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.