From OSGeo Wiki
Following is proposed 'boilerplate' language to describe the foundation and our activities in press releases, listings, event descriptions, and other public media.
The Open Source Geospatial Foundation, or OSGeo, is a not-for-profit organization whose mission is to support the collaborative development of open source geospatial software, and promote its widespread use.
About the Open Source Geospatial Foundation
The Open Source Geospatial Foundation, or OSGeo, is a not-for-profit organization whose mission is to support and promote the collaborative development of open source geospatial software, data and education. The foundation provides financial, organizational and legal support to the broader open source geospatial community. It also serves as an independent legal entity to which community members can contribute code, funding and other resources, secure in the knowledge that their contributions will be maintained for public benefit. OSGeo also serves as an outreach and advocacy organization for the open source geospatial community, and provides a common forum and shared infrastructure for improving cross-project collaboration. The foundation's projects are all freely available at www.osgeo.org and useable under an OSI-certified open source license.
Following is more personable language that has been used in ad copy.
Building the Future is a Collaborative Process
The Open Source Geospatial Foundation is a not-for-profit organization dedicated to the collaborative development of geospatial open source software and data. Our projects represent the highest quality of open, shared resources — code from low-level libraries to high-level servers, and content from map data to educational curriculum. We are developers and executives, authors and educators, users and marketers. We’re a community that provides financial, organizational, and legal support to open source geospatial projects. Join us at http://www.osgeo.org. Working together, our future is wide open.