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Is there a stable one or is one still in development? I searched around but most seem to be inactive or pretty useless.

It could be a good time to start with Paul H. plugin again. A plugin like this is rather big and to be written by a single user doesn't seems reasonable (ignore xThreads xD) when it is for free.

I don't know Paul H. plugin license, but there are others:
http://community.mybb.com/thread-28710.html
http://community.mybb.com/thread-120856.html

Those seems compatible (by license) and somehow they can be "united" into one sinlge plugin. There are other, but I don't know about the license:
http://community.mybb.com/thread-120868.html

There are even no-wiki related plugins (but that use wiki similar feature, like edit story, etc) that are under a GPL license, so finding code is not hard at all, it is about taking the time to pull it together and make it to work.

Oh, and the non-working MediaWiki integration: http://community.mybb.com/thread-90914.html / just for notes

There are 2 wiki plugins:
http://community.mybb.com/thread-120868.html
http://community.mybb.com/thread-120856.html