OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
VideoScribe - Make your own whiteboard video animations with Sparkol VideoScribe – award-winning video scribing app for PC, Mac and iPad. Free trial available.
Synfig Studio - Just another WordPress site
TTS Sketch Maker - Create amazing whiteboard sketch videos with text-to-speech human-sounding voices in minutes!
Adobe Animate - Adobe Animate is a Flash, vector animation software.
Doodly - Create your own doodle video in just 60 seconds