Wiki Spy by Neil.Fun - Thousands of linked objects taken from photos in Wikipedia articles.

Timeline of Historical Film Colors by Barbara Flueckiger - Detailed historical timeline of 250+ film color processes.

OldNYC by Dan Vanderkam - 200 years of NYC archival photos, arranged on a map of New York City.

80s.NYC by Brandon Liu and Jeremy Lechtzin - Street view photos of New York commissioned by the city in the mid 1980s.

all text in NYC by Yufeng Zhao - Searchable database of all text found in Google street view images of NYC.

Satellite Collections by Jenny O'Dell - Collections of like-objects found in satellite images.