A debugger for Linux (and hopefully macOS), written from scratch in Jai.
It’s still in its very early proof-of-concept stage (and might never leave that). But maybe the code is already of use to someone.
./smash [-work_dir <dir>] [-breakpoint <address>] [--] <program to run + args>
Then press s for "single instruction step" and c for "continue".
There’s not much more yet.