(LambdaMOO supports custom designations of gender, and comes with the following presets: neuter, male, female, either, Spivak, splat, plural, egotistical, royal, and 2nd-person).
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LambdaMOO was founded in late 1990 or early 1991 by Pavel Curtis at Xerox PARC.
Additionally, upon his return from his business trip, LambdaMOO's main creator, Pavel Curtis (screenname Archwizard Haakon), set up a system of petitions and ballots where anyone could put to popular vote anything requiring administrative powers for its implementation.