From Eclipsepedia

The following offerings are based partially or entirely on Higgins code and developed by external organizations.

Selectors:

• Azigo Selector - Adobe AIR-based selector for Windows and Mac OSX
• Novell DigitalMe for Linux/Mac - Selectors based on the Higgins GTK and Cocoa Selector 1.0 (also open source)

IdPs:

• SOPERA 3.2 - STS
• IBM Tivoli Federated Identity Manager 6.2
• Novell Bandit STS/IdP Solution - STS IdP (also open source)

Other:

• Eclipse ALF Project - The Open Integration and Interoperability Framework for ALM Tools
• Serena Business Mashups
• ...and probably others that we don't even know about :)