XenForo

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Whhhhhaaaaattttt ?
Nobody can write shameless such a sentence.
It only depends of your needs / budget.
For me Xenforo is the answer but well, hopefully there are many (free) alternatives to it...

Xenforo is nice but the cost is outrageous for those who are wanting to just use it for fun.

I would have to say that MyBB is a great start. If you're community can grow, I vote to scale it to XenForo