The idea of fibermap is it to build a map with OpenStreetMaps, which includes fibers, colocation and other network related stuff, so if you want to operate your own AS and need carriers, you have a good overview about local infrastructure. At the moment, it is just an idea.
You can find the map here: http://fibermap.quakente.net
Currently implemented Carriers:

• euNetworks (partially)
• Hofnetz