From the Mellon Award for Technology Collaboration website (where you’ll find all the details):
The Program in Research in Information Technology of the Andrew W. Mellon Foundation invites nominations for the 2007 Mellon Awards for Technology Collaboration (MATC). In support of the Program’s mission to encourage collaborative, open source software development within traditional Mellon constituencies, these awards recognize not-for-profit organizations that are making substantial contributions of their own resources toward the development of open source software and the fostering of collaborative communities to sustain open source development.