Andrew Kelley, the creator of the Zig programming language, live-codes an assembler in Zig to understand how assemblers work. Starts around 5:00 in the video.
A Git client for Plan 9. It's only 7,000 lines of code (1.1% the size of normal Git). As a bonus, check out the last line of the screenshot to see how the screenshot was created.
A DNS server written in Rust.
A program that lets you store a secret message in an image. The image below has a secret message in it!
An seL4-inspired microkernel written in Rust.
A synthesizer that turns images into music!
Art about emotions and music.
An introduction to the Zig programming language. (Zig was created by Andrew Kelley, another Recurser).
Mouse gives a great talk about the making of Gnossiennes No. 1 Forever (https://gnossiennes.mousereeve.com/)
Paint with light. Source: https://glitch.com/edit/#!/dear-stranger