Dash lets you display the contents of a web page on your Mac desktop. Whenever you update the HTML file, Dash redraws itself. It's a great tool for scripting.
Age is a replacement for GPG's file encryption features that will be easier to use without making mistakes.
A picture of the cover of The Sun Also Rises, read to you pixel by pixel. 800 chapters long. The full audio recording is 2.48 GB.
Original research on implementing a performant 2D imaging model on the GPU.
Wesley put a 4GB file in a 232KB file system by making some clever modifications to the FAT.
A tiling window manager, written from scratch. Miles used it as his main window manager for a year after writing it.
It's Tinder for birds. A faithful recreation of the real thing (including animations), but with one obvious difference. Written in Elm. Running version at https://pecker.app.
An in-browser IDE for the Piet programming language.
A minimal Go AI modeled on AlphaGo. It became the basis of Minigo (https://github.com/tensorflow/minigo), which is maintained by the Tensorflow team.