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Infuse - Media player and media server with subtitles and wide codec support.
Metastream - Watch streaming media with friends
IINA - The modern video player for macOS
Watch2Gether - Watch2Gether is an app that allows multiple people to watch the same content simultaneously and interact with each other while watching.
Clappr - An extensible media player for the web
StreamParty - StreamParty is a watch communiry, that allows you to watch video streams in sync with the people you care about, on multiple services.