This is very local, but in the last year the small fringe theaters in Boston formed an alliance to share resources and…well, it’s hard to describe. It seems so much of STAB is still being sorted out. But it has a Web presence, and if anything it exists to promote the small, fringe theaters that are popping up all over Boston, founded mainly by the graduates of the local theater programs.
The organization is primarily for the benefit of theater companies, but individual artists are welcome. I’m a member in order to stay more closely in touch with the local scene.
You can see on the site the member organizations with links to their site. It’s a good source for local theater. To be honest, production quality can be sketchy (but they are almost always risk-taking productions) or you can find the best-kept secret in Boston as I did with Tales of Ovid.