OpenMemex
Nopile
DejaView
TabNU
Random Yes
><a href=http://openmemex.com/>openmemex</a>
><a href=http://nopile.com/>nopile</a>
><a href=http://portal.acm.org/citation.cfm?id=1294289>dejaview</a>
><a href=http://tabnu.com/blog>tabnu</a>
><a href=http://randomyes.com/>RandomYes</a>