It's based on <a target="_blank" rel="noopener noreferrer" href="https://activitypub.rocks">ActivityPub</a> to connect with tools <a target="_blank" rel="noopener noreferrer" href="https://peertube.cpy.re/videos/watch/da2b08d4-a242-4170-b32a-4ec8cbdca701">like Mastodon</a> for example.
It's based on <a target="_blank" rel="noopener noreferrer" href="https://en.wikipedia.org/wiki/WebRTC">WebRTC</a>, a free and open-source project for web browsers.
PeerTube is developed by <a target="_blank" rel="noopener noreferrer" href="https://framasoft.org">Framasoft</a>, a French non-profit popular educational organization on digital issues.
It employs a developer, <a target="_blank" rel="noopener noreferrer" href="https://github.com/Chocobozzz">Chocobozzz</a>, who works since 2018 on PeerTube projects:
<a target="_blank" rel="noopener noreferrer" href="https://packages.joinpeertube.org/api/v1/ping">PeerTube plugins index</a> development and maintenance;
Moreover, Chocobozzz works on internal Framasoft's projects (<a target="_blank" rel="noopener noreferrer" href="https://framapad.org">Framapad</a>, <a target="_blank" rel="noopener noreferrer" href="https://framatalk.org">Framatalk</a>, etc.). In other words, the management of PeerTube projects is operated by only one employee, who has other responsabilities in addition to his workload.