ACL Libraries

Hi All
We are running codeigniter 2 based project and I have been asked to implement a group based user access level mechanism.
Codeigniter has no native ACL and before I will start to code something that already exists I prefer to ask for help with choosing the best option.
I am thinking about to find and implement a durable solution that has a good community support, folows the codeigniter development life cycle, is compatible with my actual codeigniter version (2) and will be compatible with newest version during upcoming upgrades.
I found few authentication libraries in this repos => https://github.com/bcit-ci/CodeIgniter/wiki/_pages .
Has anybody tried any of them?

Hi ronlin,
You can try CodeIgniter Ion Auth Library (https://github.com/benedmunds/CodeIgniter-Ion-Auth)