Freeciv Web Site: http://www.freeciv.org/
GPS3D Visualization Tool: http://www.mgix.com/gps3d/
Mesa 3-D Libraries: http://www.mesa3d.org/
OpenGL: http://www.opengl.org/
TclTicker: http://www.nyx.net/~tpoindex/tcl.html#Tclticker
The WINE Headquarters: http://www.winehq.com/
XPlanet Web Site: http://xplanet.sourceforge.net/