I want to search

MediaWiki

MediaWiki is a free web-based software application written in PHP with a backend database. It was developed by the Wikimedia Foundation and it also runs projects such as Wikispecies and WikiMediaCommons. It is the wiki tool used for WikiPedia. There are numerous extensions available for adding capabilities to MediaWiki (see http://www.mediawiki.org/wiki/Category:Extensions).

Technical Expertise Required: 
No programming
Cost: 
Free
Examples: 

KeytoNature http://www.keytonature.eu/wiki/The_Project
NOAA’s GEO-IDE Guidelines and Best Practices Wiki https://geo-ide.noaa.gov/wiki/index.php?title=Main_Page

Platform: 
Cross-platform
Tags: 
MediaWiki