OpenTheatre - Search movies, series, anime, subtitles, torrents and archives from open directories
Home-Assistant.io - Home Assistant is an open-source home automation platform running on Python 3.
Veso - Veso is an open source media server. An emby/jellyfin fork that will move to a js react framework and focus on remote/rclone mounted media rather than local storage.
ioBroker - flexible and modular application for the IoT and Smarthome
openHAB - "empowering the smart home" - vendor and technology agnostic open source home automation
Infuse - Media player and media server with subtitles and wide codec support.