Shotcut is a free, open source, cross-platform video editor. Can capture from live media devices (including JACK and PulseAudio) as well as edit media streams. Tries to have a very easy to use UI; UI can be reconfigured to optimize for the kinds of tasks you want to accomplish.

An an easy to use, quick to learn, and surprisingly powerful video editor. Designed to be simple to use yet powerful enough to accomplish some fairly complex tasks. Edit video, edit audio, import images, basic rendered effects. Does background editing and chroma-keying.

In the default Arch Linux package repos.

A software synth designed with livecoding and codejamming in mind. Optimized for the Raspberry Pi. FOSS Designed with classrooms in mind but certainly not necessary. Looks like a clean and straightforward programming language. You can definitely perform with it. There's a free to download ebook about it available on the usual appstores. soundsculpting Can also play back samples with it, not just building synth patches. Available in the Raspbian default package repository.

Video editor that specializes in adding special effects. Built using Electron. Add lightning, muzzle flashes, light sabers, and more.