NHIN Connect

CONNECT is an open source software and community that promotes IT interoperability in the U.S. healthcare system.
CONNECT enables secure electronic health data exchange among healthcare providers, insurers, government agencies
and consumer services.
 

To know more follow the links below:

http://www.connectopensource.org/

NHIN Direct

The Direct Project specifies a simple, secure, scalable, standards-based way for participants to send encrypted health information directly to known, trusted recipients over the Internet.
To know more follow the links below:

http://directproject.org/

http://wiki.directproject.org/