WebAPI - MozillaWiki
AurelioDeRosa/HTML5-API-demos · GitHub
VideoContext: An experimental HTML5 & WebGL video composition and rendering API.
Device and Sensors Working Group - W3C
Cognitive Services Video API | Microsoft Azure
Lyrebird - An API to copy the voice of anyone
Video Indexer | Microsoft Azure
MLT Multimedia Framework
GitHub - OpenTimelineIO: Open Source API and interchange format for editorial timeline information.