The Continuation of Xenosaga Petition
- A petition for the continuation of the Xenosaga series beyond Episode III.
- http://www.thepetitionsite.com/takeaction/539274038

The Truth of Xenosaga
- Translation project for Namco Bandais Xenosaga Episode III Official Complete Guide. In-depth coverage terminology from the games.
- http://www.xenotensei.com/translations/truth_of_xs.html

Xenosaga - A Missing Year
- A translation project for the Flash story released on Namco's official site, filling in the missing year between Xenosaga II and III.
- http://www.missing-year.dl.am/

Xeno Star
- A multimedia site with wallpapers, music videos, MP3s, sheet music, images, trailers, and in-depth guides to each game.
- http://xenostar.etherealdestination.net/

XenoNation
- Work in progress, and an active discussion forum.
- http://www.xenonation.com/

Xenosaga Livejournal Community
- A ring of XS bloggers, and links to other sites.
- http://community.livejournal.com/xenosaga/

Unus Mundus Forum
- A fan forum for people who love all things Xenosaga.
- http://s3.invisionfree.com/Unus_Mundus_Forum/

Xenosaga Fanfiction Archive
- An archive for Xenosaga fanfiction, containing over 100 stories and artworks to go with them.
- http://www.syldra.net/xenofiction/

Xenolegacy
- Provides detailed information on each game, with images, profiles, forums, and an Oekaki BBS.
- http://www.xenolegacy.com/