writes "Several open source projects exist under a variety of licenses, and we qualify them as free/open source depending on the license under which the final product is released. But there are other considerations, like the existence of a public roadmap, participation in the decision making, or access to the latest source code to make contributions. Vision Mobile has published a report that compares and measures the openness of several open source projects: Android, Eclipse, Linux, MeeGo, Mozilla, Qt, Symbian (till the existence of the Foundation) and WebKit. Eclipse and Linux scored the highest and Android the lowest."
A related article about the report asks whether open source needs corporate backing to truly succeed