From Harvard University's Center for Geographic Analysis (CGA) comes Harvard WorldMap, "an online, open-source mapping platform developed to lower barriers for scholars who wish to explore, visualize, edit, and publish geospatial information." Launched in 2011, WorldMap was created in part to provide a mapping platform that supports large datasets that also allows collaboration. This feature-rich tool enables anyone to create their own online mapping portal, upload large GIS layers and overlay them with other layers, and control access to their data, among many other features. Those new to WorldMap may want to start by visiting the About section, where they will find WorldMap's ample documentation, including an overview with a list of links to several existing maps as examples. The How To section includes user manuals in English, Chinese, French, and Italian, as well as video tutorials. As of this writing, WorldMap has 23,000 registered users who have created over 6,000 map collections and its lead developer is Paolo Corti, a Geospatial Engineering Fellow at the CGA.