Today at the ZendCon conference in San Francisco, Microsoft announced two additional open source Information Card Relying Party software projects. These projects for the PHP and C languages complement those that were previously announced for Ruby and Java. All make it easy for web sites to add the ability to accept and create accounts with Information Cards.
The PHP software is being built by Zend Technologies. It can be used either as a stand-alone component or in combination with the Zend Framework. The C software has been built by Ping Identity. It implements core crypto and SAML token processing code for accepting Information Cards that can be utilized from any development environment.
See these sites for details on the projects:
C Relying Party code:
PHP Relying Party: