Open Source Identity Solutions

I was asked by a colleague today to provide sources of analysis comparing Open Source IDM Solutions. I think they were looking for comparisons to closed source solutions but there is not a lot of that out there. I provided the following list as a starting point.

I generally like to save time (avoid searching for this again in the future) so I decided to put what I found here. If I am missing anything please let me know and I will update the list.

Provisioning/User Identity Management:


SSO/Access Management/Authentication:


Directory Services: