TITLE: Free open-access peer-reviewed math journals
QUESTION [75 upvotes]: 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.

REPLY [2 votes]: The Bulletin of the Irish Mathematical Society