One important core component of SimpleSAMLphp is xmlseclibs, maintained by:

We've had many contributors through the years. Here are some of them, in no particular order, that we would like to thank:

and many others who have helped use through the years make this project possible. Take a look at the list of contributors for a comprehensive list of people who have contributed to the project in one way or another. Thanks a lot to all of you!

Lots of credits to Pat Patterson which made SimpleSAMLphp possible by releasing the proof of concept implementation Lightbulb, showing that lightweight SAML implementations actually works.