Invidious is an alternative front-end to YouTube to watch your videos without ads and all the extra bloat. The official instance is here https://invidio.us. but several other instances are available.

Olive is a free non-linear video editor aiming to provide a fully-featured alternative to high-end professional video editing software.

This open source media manager streams the music to your player / web browser. It is a web-based PHP, MySQL application with an easy web install system. Ampache provides Nginx, Caddy, Lighttpd, Apache config file instruction in its documentation to help you set up your web server.

Free and open source software for video recording and live streaming. Download and start streaming quickly and easily on Windows, Mac or Linux.