Flexi Auth or Tank Auth for codeigniter auth library [closed]
I have only used Tank Auth of those two; Tank Auth is good, but gets a little heavy with FB login & other OAuth stuff, from my memory.
Another project to consider is https://github.com/benedmunds/CodeIgniter-Ion-Auth which I use a lot and occasionally contribute to - unlike Tank Auth, which has little maintenance these days, Ion Auth has a very activity community around it and pull requests are very frequent