Web Api which enables Access-Control-Allow-Origin to *

I could not find many open web api which allows CORS.

For example, http://ift.tt/2whpOz3 does but most web api prohibits resource sharing over cross domains. Some Web api support jsonp and rarely allows CORS. I don't want to set up proxy server just to avoid CORS limitation.

Can anyone suggest list of available web api where CORS from any domains is allowed?

I think such api should be useful to learn new web app technologies and help web developers try them on it.