OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Synfig Studio - Just another WordPress site
Invision - Prototyping and collaboration for design teams
Adobe Animate - Adobe Animate is a Flash, vector animation software.
ToonZoom Animate - ToonZoom Animate is a free web based animation app that works right in your browser!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.