Open-source video compositing software. Node-graph based.
Natron is a free, open-source (GPLv2 license) video compositor, similar in functionality to Adobe After Effects, Foundry's Nuke, or Blackmagic Fusion. It is portable and cross-platform (GNU/Linux, macOS, and Microsoft Windows).
Natron is a powerful Digital Compositor that can handle all of your 2D/2.5D needs. Its robust OIIO file formats and OpenFX architecture is what make Natron the most flexible open source compositor for the visual effects community. Its interface and functionally are the same across all platforms such as macOS, Linux and Windows. Natron has a powerful keying, roto/rotopaint, 2D tracking tools that are staple for all current film production project that requires visual effects.