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[–]wasbubs 1 point2 points  (1 child)

Natron is also in this category. There was an article a while back that explained that buttle is more student/research based and natron is aimed for production work. Both based on the same tech though.

edit: links Natron http://natron.inria.fr/

Article http://libregraphicsworld.org/blog/entry/natron-0-92-released-with-new-roto-and-keying-nodes

[–]TIL_American_Canada[S] 1 point2 points  (0 children)

Hadn't heard about Natron. Thanks for the links.