https://github.com/gastownhall/gascity is certainly a choice. I enjoyed playing with gas town but it was a little too nondeterministic for production code, I think.

Directionally if what you're doing is straightforward it's an amazing experience to be able to slap in an epic planning document and wake up the next day to it being "done", with a big asterisk that done-ness is directly proportional to how good of a spec and how good of a model you were using.

That being said, these days if you use Fable, slap in an epic planning document, and ask it to run a workflow (be sure to specify that subagents should use, say, Sonnet, or wave goodbye to your wallet), it's almost as good as gastown/gascity but far more predictable.