What's The Best Founder Community in SF Other Than YC?

Y Combinator is probably the best founder community in the world. What I want to know is what are the top 2-5 after them? I am not referring to accelerators as much as high signal places for builders to congregate together, connect, and build. I am in SF now and am spending time at Founders Inc., HF0, and The Residency. How do those stack up? What else is out there? Would love your thoughts.