Kim Cameron in his blog published information about WS-Federation toolkit developed for Apache 2.0 by Ping Identity as a part of their SecureID project.
This toolkit extends usage of ADFS to application developed in Java, Perl or PHP running on Apache 2.0 platform. In this way users can gain access to applications hosted on Apache server with SSO based on its credentials.
This toolkit is available here.
WS-Federation support for Apache 2.0
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