[OpenLayers-Users] free base maps

[Bilge Tutak]

Hi All,
I am currently using Openlayers with the base map from Openlayers.
I am curious if there are other free map services that can give base
maps like the Openlayers maybe also with satellite imagery?
I already know Google, Yahoo and MS ones. From these Google is the
most useful for me in terms of maps, but
I can not use it because my application is not running on single
domain (actually does not run on an actual domain, except like
localhost).

Thanks,

Bilge.