There is so many, thanks Stephen Abram.

RefWorks http://www.refworks.com/
EndNote http://www.endnote.com/
ProCite http://www.procite.com/
BibDesk http://bibdesk.sf.net
Biblioscape http://www.biblioscape.com/biblioexpress.htm
Biblioexpress 3 http://www.biblioscape.com/biblioexpress.htm
Noodle Tools NoodleBib Express http://noodletools.com/login.php
Wikindx3 http://wikindx.sourceforge.net/index2.html
Zotero http://www.zotero.org/
Connotea http://www.connotea.org/
CiteULike http://www.citeulike.org/
KnightCite http://webapps.calvin.edu/knightcite/
EasyBib http://easybib.com
KBibTeX http://www.unix-ag.uni-kl.de/~fischer/kbibtex/
BibUs http://bibus-biblio.sourceforge.net/
Evernote http://www.evernote.com/en/downloads
Refbase http://refbase.sourceforge.net/
JabRef http://jabref.sf.net
OttoBib http://www.ottobib.com
The Citation Machine and Son of Citation Machine http://citationmachine.net
Sente http://www.thirdstreetsoftware.com/
SourceAid http://www.sourceaid.com/
Hot Reference http://www.hotreference.com/
Aigaion http://www.aigaion.nl/index.php?page=features
SimplyBibTeX http://www.technotecture.com/?node=projects/simplybibtex/main
Jorge http://sourceforge.net/projects/jorge