254. Thor OsSimple operating system in C++, written from scratch
255. ChrysalispParallel OS, with GUI, Terminal, OO Assembler, Class libraries, C-Script compiler, Lisp interpreter and more...
258. SmgA decompilation of Super Mario Galaxy brought to you by a bunch of clever folks.
264. Md5 SimdAccelerate aggregated MD5 hashing performance up to 8x for AVX512 and 4x for AVX2. Useful for server applications that need to compute many MD5 sums in parallel.
272. Gurvygurvy implements Elliptic Curve Cryptography (+Pairing) for BLS12-381, BLS12-377, BW6-761, and BN256. Originally developed (and used) by gnark
278. SaltysdA collection of SD redirect patches for 3DS games
280. Pmd RedDecompilation of Pokémon Mystery Dungeon: Red Rescue Team
287. Cpuburn ArmA collection of cpuburn programs tuned for different ARM hardware
290. Sega System For FpgaFPGA Sega in Verilog, for Xilinx Virtex, circa 2002. Has an emulator thrown in, to simplify FPGA debugging.
293. Simple Polymorphic Engine Spe32Simple Polymorphic Engine (SPE32) is a simple polymorphic engine for encrypting code and data. It is an amateur project that can be used to demonstrate what polymorphic engines are.
298. Echoecho prints the first positional argument to stdout
300. CmovMeasuring cmov vs branch-mov performance