Webis - Specialised Information Service at German libraries (Overview in German)

Specialised Information Service Cartography and Geodata (SIS Maps at SBB Berlin)

Specialised Information Service for Geosciences (SIS GEO at SUB Göttingen)

Virtual Subject Library

GEO-LEO

contains: Specialist catalogue of scientifically relevant internet resources
Geo-Guide

Geoportals and more

List of online map services worldwide
   (from: Wikipedia - The Free Encyclopedia)
Geoportal.de Germany
GDI-DE German Länder
Kartenportal.CH Switzerland
Map History History of cartography
Karten, Kartographiegeschichte, Geschichtskarten
Maps, History of cartography, historic maps (Clio Guide - Collections - Maps / Citation)

Organisations

Deutsche Gesellschaft für Kartographie
adv.online.de Working group of the surveying administrations
Open Geospatial Consortium, Inc.® (OGC)
openstreetmap.org

Former special areas of collection at German libraries (Webis)

Topographische Karten
Veröffentlichungen zur Kartographie
Thematische Karten
Meteorologische und klimatologische Karten
Seekarten
Geodäsie und Vermessungswesen