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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
If it's a computer, https://github.com/filebrowser/filebrowser is pretty painless. It's not a media player specifically, but it serves up video & audio files just fine to a web browser. It does not do any reencoding like plex or jellyfin might.
LibreElec… an image that just runs Kodi. https://libreelec.tv/
NOTE:
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Hence, a higher number means a more popular project.