Free online peer reviewed journals
General directories 
- Directory of Open Access Journals
- Free Medical Journals
- Highwire Press freely available journals - many journals not completely free, but it tells you when the free access for articles starts for each journal
Specific journals 
- arXiv - Electronic preprint archive for Physics, Mathematics, Computer Science and Quantitative Biology, orginial public domain science database started in 1991
- Philica - Instant academic publishing with transparent peer-review for articles on any subject
Agriculture and fisheries 
- Agronomy Journal - all except 2006 issues freely available
- Crop Science Journal - all except 2006 issues freely available
- Soil Science of America Journal - all except 2006 issues freely available
- Acta agriculturae Slovenica - all issues available. Seems two-thirds of content is in Slovenian, the other third in English.
- Vadose Zone Journal - all except 2006 issues freely available
- Agraarteadus - Journal of Agricultural Science - all issues available - all content in both Estonian and English.
- Journal of Environmental Quality - all except 2006 issues freely available
- Journal of Natural Resources and Life Sciences Education - all issues including and before 2004 freely available (see 'archived issues')
- Agricultura Técnica - all issues available - all articles in Spanish, all abstracts also available in English. Some articles are in English as well as Spanish.
- Agricultural Engineering International - all issues available
- Agrociencia - all issues available - from 2000 onwards all articles are in both Spanish and English. Before 2000 I don't see any English articles, though I might be wrong.
- Agronomy Research - all issues available - Estonian journal all in English.
- Annals of Agricultural and Environmental Medicine - all issues seemingly available
- Applied Ecology and Environmental Research - all issues available
- Biotechnology, Agronomy, Society and Environment - all issues available, only some in English (mostly in French)
Computer science 
- Journal of University Teaching & Learning Practice (open access, but restricted copyright)
Internet and technology 
Qualitative research 
- Forum:Qualitative Social Research (in English and German)
See also 
Kennan, Mary Anne and Kautz, Karlheinz (2007) Scholarly publishing and open access: searching for understanding of an emerging is phenomenon. In Proceedings 15th European Conference on Information Systems, St.Gallen (Switzerland).