The use of open source software will become a key enabler for software-as-a-service (SaaS) platform adoption, says Gartner. However, software developers at the IQ Business Group (IQBG) say there is no such thing as a free lunch. A new Gartner report enthuses that 90% of SaaS providers will have some open source component in their technology infrastructure stacks (that is, operating system, application server and database) by 2010 to reduce software acquisition expenses.