Chip Player JS by various - Over 300,000 MIDI chiptune tracks playable in browser.

Heikki's Garden of Flowers by Heikki Lotvonen - A collection of pictoral letterpress works, mostly predating digital ASCII art.

Museum of Imaginary Musical Instruments by Deirdre Loughridge and Thomas Patteson - A collection of unrealized musical instruments from written fiction.

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

Web Design Museum by Web Design Museum.org - A project dedicated to documenting the unique design of the late-90s early-00s web.

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

Portraits of Population by Aman Bhargava and Vivek Matthew - 700+ archived charts from India's census, 1901-1991.

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.

Game UI Database by Edd Coates - A crowdsourced database of UI reference images from hundreds of video games.

Library of Juggling by libraryofjuggling - An archived guide to juggling tricks and instructions for learners.

Walkman.Land by Walkman.Land - A web encyclopedia of all walkman models

Vintage Calculators Web Museum by Nigel Tout - A celebration of the evolution of the calculator

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

Grateful Dead Fan Art Archive by UC Santa Cruz - Over 14,000 illustrated envelopes sent in to the Grateful Dead ticket service 1983-1996.

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