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OpenLayers is a web mapping framework, allowing users to pull in disparate sources of data and display them in an AJAX mapping interface.
OSGeo-Live is a self-contained bootable DVD, USB thumb drive or Virtual Machine based on Xubuntu, 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.
OSGeo is an incorporated not-for-profit organization serving as an umbrella organization for the Open Source Geospatial community in general, and 14 projects in particular. This site contains the 2008 code samples for the successful projects.