Medo is an open source (MIT licensed) video editor for Haiku, which uses OpenGL and GLSL for video effects. The fascinating feature about Medo is that the installer package fits on a floppy disk (its less than 1.44Mb). Medo is a C++17 application, and uses the Actor programming model for many-core CPU utilisation.
Github page: https://github.com/smallstepforman/Medo