The classic '90s game [L1 ].
A UNIX version was released with a Tcl/Tk scripting/GUI interface. The source code was recently released in a GPL version called "Micropolis". Source and Linux binaries available from http://www.donhopkins.com/home/micropolis/
To be included as educational software with the OLPC project. OLPC Git repository for Micropolis: [L2 ].
Discussion
Micropolis uses Tcl 6.4, Tk 2.3 and TclX 6.4c; the version numbers date these tools to the period August to December 1992 (see Tcl chronology). Any GUI based on these 15-year-old tools will look old-fashioned, and while others rush to port the code to Python/GTK+, it will be interesting to see if anyone can upgrade the code to Tcl/Tk 8.5.
Screenshots