The Directory of Open Access Journals documents free, full text, quality controlled scientific and scholarly journals, covering all subjects and many languages.

You can read more about the directory at: http://www.doaj.org/doaj?func=loadTempl&templ=about&uiLanguage=en and also about Open Access at http://www.doaj.org/doaj?func=loadTempl&templ=links&uiLanguage=en