Yeah there's so many now it's hard to settle on one. YouTube is littered with them. Agent OS, amp.code, BMAD. I'm probably trying BMAD in earnest next ...
Each of the "tools" does things slightly differently but the techniques to use them effectively are largely the same now (rules, planning, context management, good prompting).
You know like when the loom came out there were probably quite a few models but using it was similar. Like cars are now.