The eduID.cz federation is based on the Shibboleth project, which is an implementation of SAML. In theory, any SAML compatible IdP/SP may join the federation, but only the software on the list below has been successfully tested so far:

• Shibboleth IdP/SP 1.3
• Shibboleth IdP/SP 2.x
• simpleSAMLphp - SAML implementation in PHP