Slightly outdated Chicago GIS data at U of Chicago
The University of Chicago Library hosts a page with a smattering of Chicago shapefiles for ward district maps of the 90s, police beats, census tracts, and community areas. Most of this, as noted on the page, has been superseded by the City's own GIS portal, but the community area data should still be good. No license is given although there is contact info for a curator.
