And there's some good stuff there, too, including Howard Waldrop and Sean Stewart (if you're a sf/fantasy fan) and lots of other well-known genre writers:
Weightless Books.
Small Beer Press are a very well-known indie publisher run by Gavin Grant and Kelly Link, herself a very highly-regarded author of short story collections.
All books are DRM free apparently. A lot of it's still just in PDF format, unfortunately, but as they say themselves it's still early days, but quite a few books are in multiple formats.