It's for personal use, and I wouldn't call it great software, but I used Claude Code Teams in parallel to create a Fluxbox-compatible window compositor for Wayland [1].
Overall effort was a few days of agentic vibe-coding over a period of about 3 weeks. Would have been faster, but the parallel agents burn though tokens extremely quickly and hit Max plan limits in under an hour.
This is really cool. Out of curiosity did you know how to do this sort of programming prior to LLMs?
Not really, most of my programming experience is for devops/sysadmin scripts with shell/perl. I can read python/ruby from supporting application teams, but never programmed a large project or application with it myself. Last I used C was 25 years ago in some college courses and was never very good with it.
Pretty cool!