Dotspotting is easy:

Dotspotting is the first project Stamen is releasing as part of Citytracking, a project funded by the Knight News Challenge. We're making tools to help people gather data about cities and make that data more legible. The code for Dotspotting is available for download on Github, and licensed for use under the GNU General Public License.

Recent sheets:
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VS020 2014-10-29 by blech created on December 12, 2014
untitled by berman413 created on December 8, 2014
Mexico Reference Labs by kreyes created on December 4, 2014
Donde estamos by GABENER created on November 26, 2014
Associations Montpellier by clombion created on November 14, 2014
Significant Tech Real Estate Deals in San Franc... by ericrodenbeck created on November 13, 2014
wa by seanc created on November 13, 2014
Rebar Fabricators & Suppliers by r_parker created on November 11, 2014
plan_lunchtime by plan_intern created on November 10, 2014
Significant Tech Real Estate Deals in San Franc... by ericrodenbeck created on November 6, 2014
CSATravel by lrawson created on October 26, 2014
CMU COM Alumni by egesell created on October 22, 2014
Museums with Dates by george08 created on October 20, 2014
Greater London Map with Years by george08 created on October 20, 2014
London Museum Map by george08 created on October 20, 2014
untitled by jyellowt created on October 6, 2014
untitled by jyellowt created on October 6, 2014
CMU COM Alumni by egesell created on September 24, 2014
SF shelters by tnishioka created on September 9, 2014
9/2/14 Westcliff by holleespears created on September 2, 2014
untitled by valeriebubu created on August 12, 2014
France by nielsbuylinckx created on August 6, 2014
Flight centre by kauwhata created on July 29, 2014
San Francisco Emergency Drinking Water Hydrants by scottkildall created on July 24, 2014
San Francisco Cisterns by scottkildall created on July 22, 2014
Vancouver DTES bars by almccon created on July 20, 2014
untitled by broadsided press created on July 17, 2014
Dynacast - all locations + sales by nsnelling created on July 1, 2014
Dynacast locations by nsnelling created on June 23, 2014
Expo Photo by nogues created on June 16, 2014
Facilities Processing LA Waste and Recycling by dobeler created on June 12, 2014
untitled by pablo.picco created on June 10, 2014
untitled by pablo.picco created on June 10, 2014
untitled by pablo.picco created on June 10, 2014
untitled by pablo.picco created on June 10, 2014
Earthquakes by pablo.picco created on June 10, 2014
untitled by pablo.picco created on June 9, 2014
ben by baddawg99 created on June 2, 2014
PlymouthAddresses by cprentice created on June 1, 2014
untitled by saraGLCYD created on May 23, 2014
Test by ebouton created on May 20, 2014
Oakland Liquor Stores by fiercetalldonkey created on May 8, 2014
Wisconsin Schools by fanningl8819 created on April 24, 2014
untitled by jadmaps created on April 10, 2014
untitled by rpsamaan created on April 10, 2014
MRFs in LA by JackieC created on April 10, 2014
laane by RostenRosten created on April 10, 2014
MRFs in Southern California by RostenRosten created on April 10, 2014
RPA4907 / UAL1655 2014-04-06 by blech created on April 8, 2014
SKW4965 2014-04-03 by blech created on April 8, 2014