“The OGC (Open Geospatial Consortium) is an international not for profit organization committed to making quality open standards for the global geospatial community.” Information on standards, compliance, best practices, and discussion papers are available.
“OSGeo was created to support the collaborative effort of open source geospatial software, and promote its widespread use.” This site includes the option to join a mailing list to stay abreast of updates in the open source geospatial community.
“OSGeo-Live is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Lubuntu, that allows you to try a wide variety of open source geospatial software without installing anything. It is composed entirely of free software, allowing it to be freely distributed, duplicated and passed around.”
Includes Desktop GIS (including QGIS, GRASS GIS, SAGA), Brower GIS, Web Services, along with data from Natural Earth, OpenStreetMap, and more. This list is not inclusive of all materials included in the download.