1. Jellyfin: The Undisputed King of FOSS Media Servers
Jellyfin is a volunteer-built media server that puts you in complete control of your files. Unlike competitors, Jellyfin tracks nothing. It supports hardware acceleration (using Intel QuickSync, AMF, or NVENC) out of the box without requiring a premium license. It scrapes metadata accurately and offers a vast array of official clients across web OS, Android TV, and Roku. For anyone looking to self-host their movie collection, Jellyfin is the absolute best open-source starting point.
2. PeerTube: Decentralized Video Hosting
For creators looking to host publicly accessible videos without relying on YouTube, PeerTube is a revolutionary platform. Developed by Framasoft, PeerTube instances use WebTorrent technology to share the bandwidth load. If a video goes viral, the browsers of the viewers communicate peer-to-peer to distribute the video chunks, drastically reducing server costs for the host. It's part of the Fediverse, meaning users on Mastodon or other decentralized networks can interact directly with PeerTube videos.
3. Open Source Utility Players
Not all open-source streaming tools require complex server setups. Projects that provide stateless utility playback—similar to the architecture of FluxPlays—allow users to simply plug in direct HLS or MP4 URLs and stream securely in the browser. These lightweight React or Vue-based open-source projects are highly favored by developers for testing streams and bypassing restrictive CORS environments during development.