Thanks to Dmitry Pavlov, DURF (and its supplements and adventures) is now available in Russian! You can find it here :)

Other languages available besides English and Russian:

• Italian by Francesco Catenacci (can be downloaded on the main page) 
• French by Louis-Philippe Breton (can also be downloaded on the main page) 
• Spanish by Arturo Purroy
• German by Birger Lambrecht
• Portuguese (Brazilian) by Mateus M. D. Souza
• Japanese by nonntann

Cheers!

Emiel