Pratt Parsing - An improved recursive decendent parsing technique
Tree-Buf - Experimental “tree-ish” serialization (in Rust)
Conduit - Matrix homeserver written in Rust
scdoc - Simple man page generator for POSIX systems written in C99
Writing an OS in Rust - Also a very good introduction into Operating systems
Wio - Wayland compositor for Linux/FreeBSD which has a similar look & feel to plan9’s rio
SecKit, Your Second 3D Printer Kit - CoreXY 3D printer kit
Bangle.js - Open Source Hackable Smart Watch
PinePhone - An Open Hardware smartphone created by Pine64
AGAR - A BSD-licensed cross-platform GUI toolkit
Shake build system - Build system using Haskell as DSL
Clash - Functional Hardware Description Language based on Haskell