Is there any free (as in free beer, i.e., no publication fees or other fees whatsoever), open-access (free and open access to everyone) and peer-reviewed mathematics journal?
I am interested in a list of journals. I am particularly interested in my field which is low dimensional topology and geometry and geometric group theory.
The observation how well a site like MathOverflow or Math Stack Exchange works makes me wonder if a similar system does exist for the peer-reviewing and publication process itself.
Best Answer
You're asking for "diamond" open access (to contrast with the gold open access --- peer reviewed but not free --- and the green open access --- free but not peer reviewed). Here are some math journals of this type, that use arXiv as a repository (socalled "overlay journals"):
A more complete list can be accessed at the Directory of Open Access Journals (doaj.org)