Dopewars

Ben Webb's Dopewars
Freeware Windows or Linux version. [Open Source, GPL]
http://dopewars.sourceforge.net/

CCB-Dopewars
Java Swing implementation of John E Dell's old game of narcotics commerce. [Open Source, GPL]
http://freshmeat.net/projects/ccb-dopewars/?topic_id=83

Chronic 2005
Conquer the streets of Los Angeles, Seattle, and New York. Plunge into a world of dirty cops, loan sharks, pimps, informants, and bodyguards. Features free windows download, online high scores, and forums for players.
http://www.chronic2005.com/

DopeWars - The Perl Script
Version for perl with instructions in the code. [Open Source, GPL]
http://opop.nols.com/proggie/dopewars.pl

DopeWars Online
An online multiplayer version of the game. Includes a FAQ, information on how to play, and a forum.
http://www.treadon.us

Drugg Warz
AJAX Browser based version of Drug Wars playable online. Has news updates and high scores.
http://www.druggwarz.com/

DrugWarz
Windows clone with downloads of the original DOS version as well.
http://www.geocities.com/drugwarz/drugwarz.htm

Drunk Men Work Here Dopewars
Online CGI version in which you create an account, click between the boroughs, and get locked out for time period when arrested.
http://www.drunkmenworkhere.org/185.php

French Frag Factory Cartel
Strategies, tips, and helper applications for running the Windows version.
http://frenchfragfactory.net/dopewars/

Jennifer Glover
Freeware version for Windows or PocketPC with source code.
http://dopewarsppc.sourceforge.net/

Likely Software
Shareware Macintosh version with discussion board, high scores list, and screenshots.
http://www.likelysoft.com/dopewars/

SpeechSmuggler
Voice-based version that can be played over the phone by toll-free number. [Open Source]
http://www.colloquial.com/VoiceXML/SpeechSmuggler/