openSkat

http://freshmeat.net/projects/openskat/

openSkat lets you play the German card game "Skat" over IRC. Rather
than relying on a trusted server, openSkat prevents cheating by using
the zero-knowledge proofs and cryptographic algorithms described in
Schindelhauer's paper "A Toolbox for Mental Card Games"
<http://citeseer.nj.nec.com/schindelhauer98toolbox.html>.

(If you don't speak German, you may the English README 
<http://cvs.gaos.org/index/openSkat/README> useful; select 
the latest "Revision" number.)
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