Open Access Journals
Open access refers to research content that is freely available online. This most often involves peer-reviewed scientific and scholarly research which scholars publish without expectation of payment.
Following is a list of open access directories, which list open access journals according to subject:
DOAJ - Directory of Open Access Journals
BioMed Central
Open access journals in the field of biology and medicine.
Chemistry Central
A chemistry sub-set of BioMed Central.
Hindawi Journals
Over 200 open access journals from Hindawi Publishing in the fields of Engineering, Life Sciences, Mathematics, and Physical Sciences.
Golden Pages for Musicologists - Royal Holloway, University of London
Online journals in music and musicology (not all listed are open-access)
