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Xenosaga Pied Piper is a game for cell phone only released in Japan. It develops the background of Ziggy, aka Jan Sauer, when he was a policeman on Abraxas (Michtam).
An English translation of the script done by Chaoslace is available here :
http://zarathustra.kaisho.org/
Furthermore, a fan manga is currently ongoing. The author is フォレスト ( ~ Forest). In fact, it is a video-manga, which can be watched here : http://www.nicovideo.jp/mylist/9494773
This fan manga has been translated by kare_reiko, porimac and meishu. The translated scans can be read here :
chapter 1 :
http://issuu.com/the.derviche24/docs/pr__sentation3
chapter 2 :
http://issuu.com/the.derviche24/docs/pp_ch_2
chapter 3 :
http://issuu.com/the.derviche24/docs/pp_ch_3