Wikipedia:WikiProject Maps/Source materials

Active

• Perry-Castañeda Library Map Collection. Most of the maps scanned by the General Libraries and served from this web site are in the public domain. They can be tagged with commons:Template:PCL (talk, backlinks, edit) but also needs the appropriate copyright tag which depends on the source.
• GMT (Generic Mapping Tools) GPL'd software for generating maps. Comes with map data derived from two public domain databases.
• USGS Maps. Every USGS topographic map available for free download from the Internet Archive.
• OpenStreetMap official website - CC-BY-SA 2.0 vector map data collected by GPS (When visiting theirs' website, initial map location defaults to user's geo-location.)
• The Map Library - Maps for Central America and Africa. Tag with commons:Template:PD-MapLibrary (talk, backlinks, edit)
• GinkgoMaps - Free Digital Maps published under the CC-by Licence
• Library of Congress Historical Maps Collections
• Category:Wikipedia geographic image maps
• PAT public domain maps: world, regional, country state (US, CA, AU)

Potentially Defunct/Broken Links

• Free World Map, GNU maps
• Library of Congress Contemporary Maps ^{[dead link]}
• U.S. National Atlas Creates public domain maps (in SDTS, E00, Shape and TIFF formats) from U.S. Department of the Interior data. ^{[dead link]}
• Planiglobe online map creation Generates maps from public domain data. Postscript and Adobe Illustrator versions can be downloaded. Use the {{Planiglobe}} license on Commons (17 February 2014 : Planiglobe does not appear to offer this service any more).
• Libre Map Project - United States maps and GIS data released under the Creative Commons BY-SA license. Data includes many USGS DRG maps, TIGER/Map data, and boundary maps. (Also available at Internet Archive USGS Maps)
• DEMIS World Map Server generates maps using public domain data with no usage restrictions
• Geospatial One-Stop geodata.gov ^{[dead link]}
• Soviet Military Maps all in the Public Domain. One of them can be seen here. However, the Ordnance Survey has made a copyright violation claim of these maps.
• Maps of the countries of the world from the CIA

Countries

Cities

• World city maps (copyright status is the same as that for Perry-Castañeda Library Map Collection above.

And you can obtain more atlas and maps from public domain encyclopedias, books and documents.