Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
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.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
JRiver Media Center - Home · Download · Purchase · Support · Company. Share? The Most Comprehensive Media Software · The best choice for seamless audio, image, television, & video. Overview.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.