Websites
Wikipedia
OS-tans (English).
Aizawa Hikaru (English).
Aizawa Inori (English).
Madobe Nanami (Japanese).
Madobe Claudia (Japanese).
Madobe Yuu & Madobe Ai (Japanese).
Other
General
KYM article on OS-tans.
Windows7 Mania (current) (A fellow connoiseur...).
Outriders Podcast featuring OS-tans (seems to be unavailable).
BBC article on OS-tans.
Nijiura/2chan Generation
Trouble Windows OS-tan Fan Book (current page on Ohzora).
Gallery of figures for the Fan Book.
Sankaku Complex gallery of OS-tan images.
Microsoft Generation
The Verge article on OS-tans.
Nanami
Akiba PC Windows 7 arcticle.
Nanami's Facebook page (unofficial).
Nanami's Twitter (official).
ASCII page concerning the release of Windows 7 DSP edition.
AnimeLyrics translation for Seven Color Generator.
Yuu & Ai
Yuu & Ai campaign (limited edition).
Yuu & Ai sales page for the Nihonbashi editon (Yuu).
Yuu & Ai sales page for the Nihonbashi edition (Ai).
Japanese article on the limited edition release of Windows 8.
Article about Yuu & Ai (English).
Inori
The Verge article on Aizawa Inori.
Facebook Page for Aizawa Inori.
Other Tans
Toyboxarts iMac Girl.
Videos
Old Generation
Fan Content
Troubled Windows (higher quality).
Troubled Windows (BROKEN).
Trouble Windows alternate OP/ED.
Nijiura Tenshi OS-tan (the song is the ED for Hanasaka Tenshi Tenten-kun).
Arigatou, ME (MIKOMIKONASU MIKOMIKONASU MIKOMIKONASU MIKOMIKONASU).
ME-tan Jumpscare (warning: frightening!!!!).
XP-tan video (Taco Bell por ciento).
XP-tan video (full).
XP-tan video (alternate).
When the OS-Tans Crashes (you will NOT believe what song they start singing).
Other
Windows ME retrospective.
Windows XP retrospective.
New Generation
Nanami
Nanami Commercial (english subs).
Seven Color Generator (higher quality).
Yuu & Ai
Yuu & Ai CD overview (2013 collection edition).
Yuu & Ai CD box for Windows 8.1.
Inori
Wayback Machine
General
Nijiura/2chan Generation
Trouble Windows book cover (image).
Trouble Windows book (old sales page).
Text Fiend diary post about OS-tan figures.
XP-tan flash video (not working).
Otakubell comic translations.
OS-tan gallery (unsaved).
Infoseek page for OS-tans (note: only images saved in the "/page.frett.com/" directory seem to have been preserved).
Wakachan imageboard for OS-tans.
Microsoft Generation
Nanami
Madobe Nanami Windows 7 Theme CD archive.
Madobe Nanami's Sweet Memory CD archive.
The Banzai Effect article about Nanami.
Nopy's blogpost about Nanami.
Windows7 Mania (archive).
Japanator article about Nanami.
Yuu & Ai
Claudia
Claudia Academic (unsaved).
Other
Miscellaneous
Reddit post about Claudia.
Search interest for OS-tans.
Image site which contains many OS-tans.
Gelbooru (nsfw).
Yandere (nsfw).
Twitter post about hana256.
Rizuchan lyric translations.