Which OpenSource projects are — really — collaborative?

From Slashdot: “I’m a highly competent and occasionally respected software engineer, who has worked on several Open Source/Free Software projects; some of my code is in the Linux kernel. Within the OSS community, we maintain that the main point of publicly announcing OSS projects is to invite programmers to join the project and collaborate to make better software. But in about 90% of cases, I’ve found that publicly announced projects in development are not actually open to new members…”