XConq
A graphical multi-player strategy game and game design system
Xconq is an Empire-type strategy game, where each player contests for
domination of a simulated world. Unlike most empire-building games,
it features a programming language that game designers can use to
build a wide variety of games.
Games already in the distribution's library include everything from
simple combat, to elaborate world models, to silly but fun games, with
time periods ranging from ancient history into the distant future.