Highly cited, highly respected, and highly relevant, AIP Journals are the cornerstone of many physics collections.
  http://journals.aip.org  [Site Details]

ACS Publications is the leading publisher of peer-reviewed research in the chemical and related sciences, serving scientific communities worldwide.
  http://pubs.acs.org/about.html  [Site Details]

Listing of journals published by the American Psychological Association. Includes guidelines on posting articles on the Internet and journal statistics.
  http://www.apa.org/journals/  [Site Details]

Categorized, searchable links to free, full text, quality controlled scientific and scholarly journals.
  http://www.doaj.org  [Site Details]

Lists a large number of medical journals that currently provide free full-text access on the web.
  http://www.freemedicaljournals.com  [Site Details]

Subscription based academic journals site with 250 quality titles from over 40 publishers. Articles can be searched by keyword or phrase, including Boolean search.
  http://muse.jhu.edu/journals/  [Site Details]