user management framework

I'm beginning work on a new web application, and I'm looking for a framework or library that provides user management functionality. What I mean by that phrase is:

- user/role CRUD (Create, Read, Update, Delete)

- user authentication/authorization

We've always written this functionality ourselves in the past, but I'm assuming there are freely available kits out there that accomplish this very common need.

Through googling, I've found a couple possibilities, but they are very immature projects.

Are there any well-known, respected packages out there? Thanks!

[604 byte] By [feha] at [2007-10-3 6:06:01]