Gesher City
Bridging young adults to the Jewish Community by providing access to personal and professional networks and information resources in Baltimore, Boston, Chicago, New Jersey, Philadelphia, and Washington DC

JUnity.com
Junity is a site where the Jewish Community can truly connect and share.  From announcements of  life cycle events to documentation of family histories

Synaplex
About 50 congregations across the country representing all denominations and non-denominational synagogues are participating in Synaplex