Tank Auth looks good but the documentation is just a one-page explanation of how to install, plus a quick run-down of each PHP file. At least that's all I found after lots of Googling. Maybe what people mean above when they say that Tank Auth is well-documented is that the code is well-commented. That's a good thing, but different than documentation. It would have been nice to have some documentation about how to integrate Tank Auth's features with your existing code.
