User: Dr Schizzo

Another free Liberty implementation

On: E-commerce Single Sign-On Not Dead Yet

Lasso is another free (GPL) implementation of the liberty specs. It is still in heavy development but compatibility against SourceID (PingID solution) has been achieved.

The great thing in Lasso is the language bindings; PHP, Python, Java, C# (anything .NET actually), integration in existing website is easy (well, it will be much easier when the documentation is completed).