You pay taxes to the government of your country. Whenever you get an income, whatever the source might be you ought to pay taxes.Though there are
exceptions to that rule. That is donations to specific organizations that can be considered non-profit,charity etc.
So yes, if you have an income of whatever activity it may be, selling code, selling items, selling website advertisement you have to register that income to get taxed by your Country. If you dont, its tax evasion.
you dont have to pay anything by set up a free software licensed under GPL.
You dont have to pay anything to setup a server, but you have to pay if you make money from it.
Someone who didnt bother reading the svn or ant manual and just waited for you to make him a visual guide for eclipse is not a guy that is willing to learn ... He is the definition of the leecher.