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Even without GIS skills, you can make maps from certain kinds of data from the following sites--some of them are Penn-only, while others are free to the public. The restriction is that you must use the data they provide, rather than uploading your own.
Freely available web-based mapping tool includes data from the U.S. Census and ACS, along with data from other government agencies, research institutes, and non-profit organizations related to the economy, education, environment, equity, food, and health. Most data are recent, and available geography varies by data set.
Map your own data using this cloud-based mapping software. Georectified historical maps may be used as basemaps. Note: As of January 2017, Carto is transitioning to a new platform, Carto Builder. While this includes new functionality, the interface has changed; anticipate changes when using guides and documentation.