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Good point. If we add blender we also have to add Houdini I guess :D

Also Dynamo[0] and Grasshopper[1]

Da Vinci Resolve, Unreal Engine, everything is going node based.

Agreed, many VFX graphics programs are node based - two more would be Nuke and Katana from The Foundry.

Natron would be an open source clone of Nuke, similar to how Gaffer is essentially an open source clone of Katana