Software developed by a company founded by South African billionaire Mark Shuttleworth has been installed by Google, the world's most-used search engine. Despite such a prominent endorsement, Shuttleworth will not be making any money: the software is free to use. Since selling his internet company to Verisign for US$575m in 2000, Shuttleworth has become a champion of open source, the free-to-use, free-to-alter software that challenges costly brand-name products.