Dannell Lites was a prolific and beloved writer of fan fiction and filk in both Marvel and DC universes, as well as Highlander: The Series. Since her passing in 2002, her friend and sometime collaborator kerithwyn has made Dannell's work available on her archive. To ensure their posterity, kerithwyn and Open Doors have also preserved her works on AO3.
Stargatefan, started in 1997, is a large fansite devoted to Stargate SG-1 and Stargate Atlantis that features fic, art, links, historical information relevant to the show, and other resources for fans. In 2013, the Organization for Transformative Works announced that Open Doors would assist StargateFan in preserving over 2,000 stories, fan art, and comics to their own collection on AO3.
The Good Omens Library: A Nice and Accurate Stories Archive, first opened in 2005 as a hub for Good Omens fanfiction. After eight years, decreased funds and usership nearly closed the archive for good. To preserve its works and allow the collection to continue to grow, it was imported into a new AO3 collection in 2013.