What is ButtleOFX?
ButtleOFX is a simple, user-friendly and open source compositing software. It is based on TuttleOFX, an open source, modular and sustainable image processing architecture.
ButtleOFX allows you to easily create special effects for your photos and videos thanks to its features.
as evidenced by their github page, the team is no longer developing it any further. They are looking for a maintainer. The last commit is over a year old.