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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Artiempo by nogues created on April 23, 2015
untitled by bethpeery created on April 20, 2015
untitled by ruben created on April 9, 2015
Robert Adam's Grand Tour by jackdsargeant created on April 9, 2015
untitled by jackdsargeant created on April 9, 2015
Test by shiaue created on April 2, 2015
VRD27 2015-03-14 by blech created on March 30, 2015
deneme by ardelia created on March 27, 2015
untitled by jllucas created on March 24, 2015
AR Ref. Labs by kreyes created on March 19, 2015
Ames Intersections by bahanson created on March 11, 2015
untitled by kristimoe created on March 9, 2015
Hackfest by nlemay created on March 9, 2015
Hackfest by nlemay created on March 9, 2015
untitled by kathryn@redeemerknoxville.org created on March 4, 2015
untitled by kathryn@redeemerknoxville.org created on March 4, 2015
untitled by kathryn@redeemerknoxville.org created on March 3, 2015
untitled by newpoject created on March 2, 2015
Asia by lcont1 created on February 25, 2015
Test Dots by lcont1 created on February 25, 2015
SpringStores by metonim created on February 18, 2015
LeedsArtCrawl_071014 by shi created on February 2, 2015
SPC Test by foreigner_co created on January 30, 2015
Significant Tech Real Estate Deals in San Franc... by seanc created on January 20, 2015
untitled by Karlien created on January 5, 2015
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