Danga Interactive was Brad Fitzpatrick's company that developed LiveJournal and by necessity the backend software to drive it all. Since Danga's acqusition by Six Apart, the meaning of "Danga" is somewhat undefined. It mostly represents this website (danga.com) and this software.
‒ Courtesy of Danga Interactive
There are currently 8 groups being archived from Danga (danga.com).