Simple VLC-based media player that can play multiple videos at the same time. You can play as many videos as you like, the only limit is your hardware. It supports all video formats that VLC supports (which is all of them). You can save your playlist retaining information about the position, sound volume, loops, aspect ratio, etc.
Support for any video and audio format (VLC)
Support for (almost) any streaming URLs (streamlink + yt-dlp)