MediaWiki is the collaborative editing software that runs Wikipedia, the free encyclopedia, and other projects. MediaWiki is no longer distributed via SourceForge, for downloads and other information please visit www.mediawiki.org.
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching geometry, algebra, statistics, and calculus. Download the free software at http://www.geogebra.org. Find the source code at http://www.geogebra.org/trac