Volunteered geographic information

Wikivoyage is a free web-based travel guide for travel destinations and travel topics written by volunteer authors. It is a sister project of Wikipedia and supported and hosted by the same non-profit Wikimedia Foundation (WMF). Wikivoyage has been called the "Wikipedia of travel guides".

Wikitravel is a web-based collaborative travel guide based on the wiki format and owned by Internet Brands. It was most active from 2003 through 2012, when most of its editing community left and brought their contributions to the nonprofit Wikivoyage guide.

Tripadvisor is an American company that operates online travel agencies, comparison shopping websites, and mobile apps with user-generated content.

thumb|Geotag information in a JPEG photo, shown by the software [[gThumb]] thumb|Geotag information stamped onto a JPEG photo by the software GPStamper thumb|Geotagger "Solmeta N2" for the Nikon D5000 DSLR

Yelp Inc. is an American company that develops the Yelp.com website and the Yelp mobile app, which publishes crowd-sourced reviews about businesses. It also operates Yelp Guest Manager, a table reservation service. It is headquartered in San Francisco.

distributed photodocumentary project recording visits to intersections of integer degree standard meridians and parallels

harnessing of tools to create, assemble, and disseminate geographic data provided voluntarily by individual

LocalWiki is a collaborative project that aims to collect and open the world's local knowledge. The LocalWiki project was founded by DavisWiki creators Mike Ivanov and Philip Neustrom and is a 501(c)(3) nonprofit organization based in San Francisco, California. LocalWiki is both the name of the project and the software that runs the project's websites.