libobs

StreamFX is a plugin for OBS® Studio which adds many new effects, filters, sources, transitions and encoders! Be it 3D Transform, Blur, complex Masking, or even custom shaders, you'll find it all here.

An OBS plugin for removing background in portrait images (video), making it easy to replace the background when recording or streaming.

Open-source game recording management software

A simple .NET library that provides bindings for libobs