ColdMUD
                                                        Influenced by LambdaMOO, LPMud, and CoolMUD, both by their object-oriented design, and languages, ColdMUD was an original codebase that developed its own original language, originally termed (humorously) as C-- (which was then later forked as the non-MUD language ColdC). 
ColdMUD enjoyed some popularity for a short period, and despite a considerable amount of development, being relatively stable, and able to be compiled on a variety of operating systems, the codebase never quite reached critical mass.
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Downloads
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Version 0.12.1c
coldmud-0.12-1c.tar.bz2
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Original Developers
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Greg Hudson
 
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Language(s)
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C
 
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Release Year
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1993
 
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Software License
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None
 
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See also
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This is the ColdMUD driver, a multi-user disk-based object-oriented programmable network database server