LinCity-NG is a free and open-source city building & urban planning simulation game. The game is heavily inspired by the commercial SimCity series, sharing a quite similar gameplay and objective. Lincity-NG is a fork of the original Lincity, but with many improvements such as: improved 3D graphics, new interface and sounds.
Mac OS X 10.5 or newer
Intel powered Mac
OpenGL compliant graphics card
Free download at lincity.sourceforge.net