NiMUD
                                                        Also originally known as The Isles, NiMUD was the light-hearted rival to the popular Rivers of MUD (ROM).  It was (and remains to this day) one of the most fleshed out, advanced, and evolved Diku-based projects.
Though there may be some contention on this, The Isles/NiMUD is largely credited with being the very first codebase (especially in the Diku realm) to provide features like OLC (Online Creation), a leveless character system, a merchant system, a gem-based spell system, and many others.
Download latest build
Downloads
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Version 5
NiM5-final.tar.bz2
 - Download Package
 
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Original Developers
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Locke
 
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Language(s)
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C
 
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Release Year
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1994
 
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Software License
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Custom
 
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See also
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I'd like to take this opportunity to congratulate you on writing a wonderful piece of software (virtual novel? roleplaying arena?), and thank you for allowing the masses to examine it's internals."
-RaVeN/Aberlon