Jellyfin is a Free Software Media System that puts you in control of managing and streaming your media. It is an alternative to the proprietary Emby and Plex, to provide media from a dedicated server to end-user devices via multiple apps. Jellyfin is descended from Emby's 3.5.2 release and ported to the .NET Core framework to enable full cross-platform support. There are no strings attached, no premium licenses or features, and no hidden agendas: just a team who want to build something better and work together to achieve it.
Want to get starting using Jellyfin right now? Check out the pages below for how to install Jellyfin on your machine: Arch, Debian, Ubuntu, Fedora, CentOS, Docker, unRaid, Kubernetes, Windows, MacOS, Generic Linux
Jellyfin top highlight for me is that it comes with native instructions to run it portably (untested!) -- more info at jellyfin.org/docs/general/installation/windows/#install-manually-portable...
Jellyfin is currently at its v10.8.10 release (changes and downloads at https://github.com/jellyfin/jellyfin/releases).
EDIT: Well, apparently, Jellyfin's Windows binaries are hosted elsewhere...