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[eluser]jedd[/eluser]
Vanilla looks pretty cool. They hide their licence information remarkably well - had to go to WP to find out that it's released under the GPL.

I suspect two problems with integrating this into a CI site. First, Vanilla has its own framework. Possibly not insurmountable, but it depends how much stuff you want to do under the hood. Second it includes its own user auth system.

I suspect that anyone contemplating a 'drop-in forum system' already has their own auth system (only because otherwise it implies that so far they've installed MySQL and PHP and are now looking for a 'drop-in-and-does-everything' system). Probably the same huge integration problem you'll have with any drop-in, rather than tack-on, lump of code.