Wikimon, a Digimon wiki
DoujinStyle, lots of doujin music
LEN'EN PROJECT WIKI!!!!!!!!!!!!!!!!!!!!
Osamu Sato Archives
GRSites Textures, backgrounds for your site
Dynasty Scans, mainly yuri manga and doujins NSFW WARNING it is not entirely nsfw but it does include those, the ones that are nsfw are tagged as such
foobar2000, my favorite audio file player
Flat2d, has bunch of old discontinued or otherwise unthought of art programs
kuukunen, insane amount of touhou doujin music up to 2012
UTAU Lost Media
UTAU Visual Archive
List of drawing tutorials and references, has nudity and suggestive poses in some of them
Enchanted Bros, wiki for the first magicians quest/enchanted folk/tongari boushi game (Why does it have so many names???)