CKAN is the Comprehensive Knowledge Archive Network, a registry of open knowledge packages and projects (and a few closed ones).

CKAN makes it easy to find, share and reuse open content and data, especially in ways that are machine automatable.

As a system CKAN functions as a synthesis of several different services:

Currently CKAN has 3 Dutch datasets, look  here en will be available in Dutch shortly

Related posts:

1. Nederland op CKAN
2. Draft Public Data Principles
3. Maine.gov DataShare
4. Open Bermuda
5. http://www.datadotgc.ca/