Some (serious) open access journals in mathematics

The following list was originally compiled by Thomas Sauvaget on his blog, Episodic Thoughts, now in stasis. He gave me permission to now host it here and update it as I see fit. If you feel that there is a respectable open access maths journal missing, preferably one that does not charge APCs, then let me know in the comments. Please search in the comments at Thomas’ post to see if it hadn’t already been suggested. I will edit this post as needed, and note that at present I haven’t gone through the list to double check all of these. I will place the checked list under an Creative Commons license at some point.