A luminance keyer for Resolume Arena and Avenue as FFGL, for Resolve, Vegas, Nuke and Natron as OpenFX, and for After Effects and Premiere Pro. It comes as macOS universal and Windows x64, plus a Linux OpenFX build.
This demo runs the plugin's shader in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its project page.