Collaboration Software integration with PHPBB

I am somewhat unsure where to start with this project. We are looking to add a wiki style study guide section to our site at <[login to view URL]>. The goal is to enable our PHPBB users to create and edit community study notes for certification exams. Ideally, we would like the coder to suggest open source software which we would need to first approve. Our? software needs are basic.? To start, we need our registered users to be able to create and edit study guides. When a user edits a document, it needs to show who edited it in case of problems/spam. After finding? appropriate software, we'll have the coder? install it? and integrate it with our PHPBB forums with little or no changes (as few as possible)? to our PHPBB code. The reason for this is that our PHPBB software has already been heavily modded and integrated with? 3 other pieces of software on our site and we don't want to ruin any of the previous coding work. The integration with PHPBB only needs to involve users, groups, and permissions so that users who have registered for our site, do not have to register again to participate in authoring and editing the study guides. If a new user tries to register or login from the new study guide section, they should be redirected to PHPBB's registration/login forms. It would be nice if the new software can be modified to fit the look of our site. Please let me know if you have any questions. Thanks!