Writing
The long ones. Shorter entries live in notes.
Voyager FDS Emulator
The only emulator for the computer leaving the solar system. Built from original JPL documentation found in a university archive in Kansas, after NASA said no and a chain of links from a blog to Reddit to Hackaday led to a filing cabinet in Wichita. Now being put on a chip the width of a human hair.
Booth
An open-source GPU compiler written from scratch in C99. Takes CUDA, HIP and Triton and targets AMD, NVIDIA, Tenstorrent, or a plain CPU with no GPU at all. Tested by simulating nuclear reactors, because orthodox was never really the plan.
Ernest
A quantum compiler in C99 that ran a frame of DOOM on real IBM hardware, then learned to compile Fortran to quantum circuits. The whole field runs on Python, which is a strange choice for the mathematics that has been written in Fortran for sixty years.
HALMAT
Reconstructing the Space Shuttle's undocumented compiler intermediate language. All 180 opcodes across 9 classes, recovered by parsing 630 source files that nobody had touched since the 1990s. Built on Ron Burkey's Virtual AGC project.
MPB
Mainframe Package Bureau. A package manager for COBOL, HLASM, REXX, PL/I, and JCL, standing on fifty years of communal generosity that started with Arnold Casinghino mailing magnetic tapes through the post in 1975.