open access initiatives and similar tendencies to open up scientific
sources to the researcher and allowing access free of cost.

from c't 18/2002
http://www.iuk-initiative.org
http://www.mathematik.uni-bielefld.de/~rehmann/BIB/AMS/Publisher.html
http://xxx.lanl.gov
http://arxiv.org
http://web.mit.edu/dspace
http://elib.zib.de/IMU
http://www.ceic.math.ca/Best-Practices.html
http://www.math-net.de
http://neofonie.de/profil/forschung_und_entwicklung/s2s.jsp
http://www.soros.org/openaccess/g/[Budapest Open Access Initiative (de)]
http://www.arl.org/sparc[SPARC's agenda focuses on [..] access to peer-reviewed scholarship.(en)]
http://link.springer.de[online information service of springer (en)]
http://www.publiclibraryofscience.org[establishment of international online public libraries of science(en)]
http://www.getinfo-doc.de[GetInfo is a central port of call for searching and accessing the full texts of publications from relevant publishers as well as full texts of "grey" literature.(en)]
http://www.oc4home.org[open community (de)]