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I want to have discussion site like SO for another purpose.

IS source of SO like sites free?

From where i can download, can i use on any site for any purpose free.

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up vote 4 down vote accepted

No, StackExchange and StackOverflow are not open-source software. However, you can pay a fee to use the stackexchange software on your own site1.

Alternatively, google for "open-source stackoverflow clone", which should give you a free alternative.

1 Apparently, stackexchange offers the first 45 days free as a trial

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I need php/mysql based clone of like SO – Jitendra Feb 26 '10 at 0:07
Get to work creating it then :) – Earlz Feb 26 '10 at 0:10
I think SO is based on .net framework – Jitendra Feb 26 '10 at 0:13
Yes, ASP.Net MVC I believe is what Joel said it was made with in some blog entry – Earlz Feb 26 '10 at 0:27
@Jitendra the first google result I came up with is, which is hosted on github for you at – a_m0d Feb 26 '10 at 0:47
@a_m0d - Thanks for this link – Jitendra Feb 26 '10 at 0:56

You should see the list of SO clones, some of which are open source, developed on the language the OP liked the most (Python, Ruby, PHP, ASP.Net).

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You cannot download the source. Those sites are hosted by the Stack Exchange platform.

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