Managing a private wiki

MediaWiki software is freely licensed, so anyone with access to a server can start their own wikis. Some hosting companies specialize in it as well.

What you need

 * /MySQL/ or /PostgreSQL/
 * /Apache/ or /Internet Information Services/
 * /PHP/
 * /MediaWiki/

On the server

 * /LocalSettings.php/
 * /AdminSettings.php/
 * /Extensions/
 * /Upgrading/