Deku - Functional view library for building UI components as an alternative to React
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.
Preact.js - Preact is a fast 3kB alternative to React with the same modern API. Components & Virtual DOM.
Emby - media server for personal streaming movies tv music photos in mobile app or browser for all devices android iOS windows phone appletv androidtv smarttv and dlna.
Glimmer - Fast and light-weight UI components for the web
Universal Media Server - Universal Media Server allows you to host your entire library of video, music, and pictures, and broadcast them conveniently to a wide variety of different devices.