Free (barter) transactions are taxable as well! (Score -1, Troll)

Most open source software comes with a built-in tax break. No income, no income tax.

I know this was intended as a joke, but this is not stricly true. Barter transaction are taxable. What happens is that the IRS will "estimate" the value of the service rendered or good manufactured, and tax both parties of the barter exchange on that. However, in most normal circumstances ("you fix my computer, and I give you a case of beer"), the value involved is far too small for the IRS to bother.