Excellent free open source video editing software, it’s a proper NLE with many useful features, and probably the most popular libre alternative to Adobe Premiere. As the name suggests, it’s made by the KDE FOSS community.
Blender is an extremely popular free open source software package for creating 3D and 2D animations, generating CGI effects for live action, and editing video. It’s available for Linux, Mac and Windows. They run their own PeerTube server on the Fediverse which is packed with short animated films, video tutorials and news about the software.