I’m looking for a good third party forum that is, at least somewhat, easy to integrate with a Yii app I’m working on. By “integrate” I mean that only users of my app are allowed to use the forum and that if they are already signed in to the app, then they don’t need to sign in again with the forum.
I didn’t check it personally but I think is more flexible to extended by you without tricks.
If you want third party in any case, you have to check the architecture of this forum like session, cookies, database authenticate system and make the appropriate changes of code.