Overview 2D animation SW open source

Hallo everybody,
searching for ideas and reference I have found these software surely open source:

  • Synfig Studio
  • Tupi 2D magic
  • Easy Toon
  • the Purple Suite: Purple Elephant and other animals (Owl, Koala, Chameleon)
  • sprite editor Aseprite, Grax2 Moai (do you remember Deluxe Paint and Animator Pro ?)

Other suggestions are welcome.

Have a nice Sunday

For Linux;
. KToon
. Ella

(I think both use Vector Layer approach)

Tupi 2D is the Ktoon’s fork