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Software that uses CHICKEN

Sedna
An industrial strength native XML database for Windows (written in C++ and CHICKEN), which offers Java and Scheme bindings, released by The Institute of System Programming of the Russian Academy of Science.
Hive
A source code manager by Kirill Lisovsky.
SCOP
Sven Hartrumpf ported the SCOP networking library by David Ingram to C and also implemented bindings to Chicken and Bigloo.
Hato
Alex Shinn's Mail Transfer Agent.

TODO: Change the format for the rest of the list.