An online collaborative encyclopedia.

WikiMapia is an online map and satellite imaging resource that combines Google Maps with a wiki system, allowing users to add information (in the form of a note) to any location on earth.

Collaborative project for creating a free lexical database in every language, complete with meanings, etymologies, and pronunciations.

International non-profit organization dedicated to encouraging the growth and development of free content, multilingual, wiki-based projects, and to providing the full content of those projects to...

Provides concise how-to articles written by professionals and users covering a broad range of topics.