Who stands behind these Open Source products?

There are many companies that either offer commercial support for open-source products, or maintain their own open-source products and sell support as their only income.

In the free-support realm, there are countless websites hosting support forums for open-source projects. The Ubuntu Linux community is a great example. Ubuntu has one of the largest community support groups of any Linux variant.

In addition to free, online support, there are dozens, if not hundreds, of books published on open-source products each year. O'Reilly Media is a large publisher of technical books, as any true computer enthusiast will attest to.