The CKAN software is the de facto standard for Open Data portals. So I started to manually collect a list of portal URLs together with their API.
At the moment there is a focus on portals in Europe and especially on portals in Austria in the list. If you have any portals not listed (no matter which country) please contact me or leave them in the comments.
(Here is the link to the document on Google Docs)
I want to start a second list containing Socrata portals but I’m currently missing URLs. So I would be also interested in any Socrata portals!