There's no code review system for Fossil, because the SQLite guy doesn't believe in formalized code review. It also doesn't have any good flow for accepting external contributions other than .patch/bundle files, because the SQLite guy doesn't believe anyone but him is good enough to regularly contribute code.
It might be great for single person projects, which I guess is fine for hobby stuff, but unless you luck out like Richard Hipp and manage to become a well-paid hermit working in a effectively-one-person cathedral model, then it's not really going to work for most projects.
It might be great for single person projects, which I guess is fine for hobby stuff, but unless you luck out like Richard Hipp and manage to become a well-paid hermit working in a effectively-one-person cathedral model, then it's not really going to work for most projects.