Natron is one of the free software projects I want to talk about. It is mainly available on Linux, although I am pretty sure it can also be used on Windows. Natron is often compared to DaVinci Fusion because both use a node based workflow. While DaVinci Resolve is free with a paid Studio version, I often find that Resolve makes my laptop heat up and playback can become very sluggish.

Most of the time I have to work with quarter resolution previews and proxy clips just to get smoother playback. Natron feels much lighter in comparison, especially on Linux. Since it focuses on compositing rather than being a full video editing suite, it can be easier on system resources while still giving access to a professional node based workflow.
One of the biggest advantages of Natron is that it is open source. It provides a great way to learn node based compositing without needing expensive software or powerful hardware. While it does not have all the features and industry adoption of Fusion or Nuke, it offers a solid introduction to the same concepts and workflow that professionals use throughout the visual effects industry.
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