Cryptography is not Magic, says Loup Vaillant, creator of Monocypher.
The Next Steps for Single Ownership and RAII, by Evan Ovadia. Sounds pretty cool.
Faster Population Counts Using AVX2 Instructions (2018), by Wojciech Muła, Nathan Kurz, and Daniel Lemire.
Minithesis, an incredibly minimal implementation of the core idea of Hypothesis, the property-based testing library.
Project Oberon emulator in JavaScript and Java and WASM.