This is the website of the openZIM project.
For more information on what openZIM does see the Mission of openZIM.
Apart from that openZIM is an open source project, generating free software (GPL) and a free documented file format.
This website runs MediaWiki, the software behind Wikipedia. Everyone is allowed to sign up and edit in this wiki. But please be aware that destructional changes will be reverted and vandalising users will eventually be indefinetely blocked.