Semantic information collections on the web. (Semantic Wikipedia) There are lots of technologies supporting semantic information markup even as wiki software.

I am wondering if there is any kind of broad information collection project like Wikipedia which features semantic markup of those information.

Google didn't bring up a project like this (only for very specific topics like software) or i just didn't find the right keyword.

Does anyone know about something like this?
DBpedia provides structured information from Wikipedia.

It uses RDF, and is one of the most known Linked Data datasets.

Also of interest (but not using information from Wikipedia) may be Freebase and OpenCyc.