It's an effort headed by an aid worker in Africa (Alex Weir). Basically, he wanted to produce a compendium of useful information which could be applied by developing nations; topics like agriculture, engineering, construction, sanitation, medicine, etc. . Much of the source material comes from UN publications, so its more current and applicable than "turn of the century" techniques. Among the interesting items, it includes an html, hypertext expert system for medical diagnostics. You go to the start page, click relevant symptoms, and eventually it leads you to a guestimate of what's ailing you. Its not remotely as competent as an actual doctor, but its better than nothing when you're stuck "in the Bush".
Besides the information being indexed and organized, Weir had a vision of burning the collection on DVDs and distributing them to the third world. (At one point, it appeared he was reorganizing the material as pdf pages which could be viewed by a DVD player, using DVD menus. That would remove the need for a conventional computer or tablet to access the material. I don't know if it ever got finished.) About a year or two ago, he decided to reorganize the collection in a hybrid wiki form, which he calls "microdownloads". Its now updated more frequently, and the DVD collection will probably not be revised.
Unfortunately, it looks like the Facebook page hasn't been updated since 4/11/14, and Google has a link hinting that the site was "hacked". Finally, going to the website pops up a login window. I'm not sure if that's a new development in response to the hacking, or that the hacker still "controls" the site. Perhaps Mr. Weir is still in Africa and can't address the situation until he's returned to civilization. Its pretty unusable in its current state, but there's probably a way to find a previous working mirror of the site.
In any case, I'll leave links for people who wish to investigate the issue further, and more important, a magnet link to pickup the 2012 cd3wd 6 DVD collection by torrent.
facebook
cd3wd site
magnet:?xt=urn:btih:7AEE811F0E802B29C1F2E4C785CE866F94AA2084&dn=cd3wd%202012%206%20dvds&tr=udp%3a%2f%2ftracker.ccc.de%3a80&tr=http%3a%2f%2f64.244.102.71%2fannounce&tr=udp%3a%2f%2ftracker.openbittorrent.com%3a80&tr=udp%3a%2f%2ftracker.istole.it%3a80&tr=udp%3a%2f%2ftracker.openbittorrent.com%3a80%2fannounce&tr=udp%3a%2f%2ftracker.publicbt.com%3a80%2fannounce