Gupshup runs on VB which is not free, it will cost you around 100-150$ ..
Go for PHPbb which has pretty much the same functionality of VB and its open source.
Change the code comments,.. add your name.. and boom.. boom.. you will be the first Pakistani who created a powerful forum software … and your name will be everywhere.. on geo.. jang.. .internet .. 
phpBB • Creating Communities Worldwide
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by the way… i did this kind a thing for my finals too 