This directory of OA journals is hosted by Lund University Libraries in Sweden. From their homepage: http://www.doaj.org:
“DOAJ is an online directory that indexes and provides access to high quality, open access, peer-reviewed journals.” One can search by keywords or browse through broader and narrower subject headings.
These stats are from their website, accessed Sept. 28, 2015:
Seen in “Outstanding Websites of 2014”, Choice, Sept. 2015, p. 33
PhysMath Central is a new journals/articles publishing platform operated by BioMed Central, featuring "immediate open access" and peer review. It is already indexed in Scopus and CAS.
Chemistry Central is a new service publishing peer-reviewed open access research in chemistry, from BioMed Central – the leading biomedical open access publisher. This site features chemistry-related articles published in Chemistry Central Journal, BioMed Central journals and independent journals utilizing BioMed Central’s open access publishing services. All original research articles published by, or in cooperation with, Chemistry Central are made freely and permanently accessible online immediately upon publication.
Jump to: latest published articles
Source: BioMed Central Update 11 March, 2009