- Labyrinthos.org - Complete information on all games in the series including spinoffs and remakes. Hosts trailers and artwork in addition to an ongoing project of scanning and translating official japanese material. There is also a detailed glossary of terms for each game.
- Unus Mundus Forum - A fan forum for people who love all things Xenosaga.
- Xeno Star - A multimedia site with wallpapers, music videos, MP3s, sheet music, images, trailers, and in-depth guides to each game.
- Xenolegacy - Provides detailed information on each game, with images, profiles, forums, and an Oekaki BBS.
- Xenosaga Fanfiction Archive - An archive for Xenosaga fanfiction, containing over 100 stories and artworks to go with them.