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
Serviio - Web on Big Screen. Serviio enables playback of online sources like RSS feeds, live streams or web site content so that you can listen to your favourite podcasts or watch latest TV programmes published online.