Adobe Animate - Adobe Animate is a Flash, vector animation software.
OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Wick Editor - The Internet's free and open-source creation toolkit.
Synfig Studio - Just another WordPress site
Express Animate - Easily create stunning 2D animations using keyframes with this motion graphics software. Export to video, flash, GIF or HTML5. Free Download for Windows.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.