Of the vector based I recall:
- Anime Studio
- Toon Boom Studio/Harmony/Animate
- Macromedia/Adobe Flash/Animate
- Synfig Studio (Open Source)
Of the raster based:
- Celsys Retas
- Toonz Harlequin/Bravo
- TVPaint Animation
There are some others in both categories but I don't remember them right now. Feel free to add to the list.
The description on their site: "VPaint is an experimental vector graphics editor based on the Vector Animation Complex (VAC), a technology developed by a collaboration of researchers at Inria and the University of British Columbia, featured at SIGGRAPH 2015. It allows you to create resolution-independent illustrations and animations using innovative techniques."
It is now under the KDE umbrella.
disclaimer: I work there
Still, tried signing up on the free account to see if it's any good, as there's some old PostgreSQL training things in Flash that would be useful updated...
b) Account sign-up doesn't work. Typing in email address, then clicking the "CREATE" button... goes forever. The little circle thing just spins and spins. Waited several minutes, then gave up.
Oh well. :(
I develop a 2D procedural mesh and skeletal animation tool called Creature: http://creature.kestrelmoon.com/
Check it out here.