Trove, an initiative of the National Library of Australia, is a vast online repository of digitised books, images, historic newspapers, maps and more.
John Cage Unbound, A Living Archive is a multimedia exhibition created by the New York Public Library documenting their collection of videos, original notes and manuscripts of contemporary American composer and music theorist John Cage (1912-1992). "Cage believed that, following his detailed directions, anyone could make music from any kind of instrument" so the NYPL is asking visitors how they would bring his music to life, by submitting videos of their own interpretations of Cage’s work for possible inclusion in the archive. For more extensive collections of John Cage resources, see: WNYC: A John Cage Web Reliquary and Josh Rosen's fan page. [more inside]
Why don't rabbits burrow rectangular burrows? Why didn't early man make rectagular caves?
Archigram are amongst the most seminal, iconoclastic and influential architectural groups of the modern age. They created some of the 20th century's most iconic images and projects, rethought the relationship of technology, society and architecture, predicted and envisioned the information revolution decades before it came to pass, and reinvented a whole mode of architectural education – and therefore produced a seam of architectural thought with truly global impact.The Archigram Archival Project is an online, searchable database of all the available works of Archigram [and much, much more] for study by architectural specialists and the general public. [more inside]
The UCLA Folkmed Database A searchable database of over 200,000 distinct folk medicine remedies for ailments of all kinds. The entries are pretty barebones, but -- oh, oh ick.
Sacco and Vanzetti et al. The amazing Famous Trials website, compiled as a labor of love by University of Missouri law professor Douglas Linder, is a motherlode of information on historically significant trails, ranging from Galileo to the Amistad to Lenny Bruce. It features not only official transcripts, but also equally intriguing details such as a map of the railroad cars in the Scottsboro Boys trial, Klan documents from the Mississippi Burning case, and opinion polls related to the My Lai courts martial.
Online collection of children's literature circa 1850 and up. Primarily American and British, from thrilling stories of the ocean to a peep at the beasts. Every page (and even the spine) digitized in both JPEG and PDF format, and in some cases color-corrected. (Similar collections have been posted here previously)
The MacTutor History of Mathematics archive from the University of St. Andrews' School of Mathematics and Statistics.