Until fairly recently, access to FreeBSD.org machines was only granted to those individuals holding commit rights to some part of the FreeBSD code repository (e.g., src, ports, doc, www), and who were thus referred to as committers. This was equivalent to having an @FreeBSD.org email address.
Since 2007, several people have been granted @FreeBSD.org email addresses in special cases. The first was to add people who were granted access to the GNATS database without actually having rights to commit to the repository. This generalized the permissions concept for the project from committer to developer. In addition, a few other individuals who have had a long-term involvement with FreeBSD have also been added to the ranks of developers. Again, these are special cases.
All FreeBSD developers are welcome to join the DevelopersGroup.
Other people in the FreeBSD community may be added to the ContributorsGroup. Note that, however, this wiki is not oriented towards users; its focus remains development-centric. (For instance, we have added the SummerOfCode participants to the ContributorsGroup.)