XPilot.org - The classic XPilot site.

xpilot.sourceforge.net - Home of XPilot NG, which adds polygonal map support and the SDL client.

BuckoSoft - Home of Dick Balaska, XPilotNT - The Windows port of original XPilot, XPilot5 - A refactoring of XPilot written in C++, and this very helpful keyboard map from Klaus K├╝hnl.

j-a-r-n-o.nl - An extremely helpful site by J-a-r-n-o, complete with newbie guide and shipshape catalog.

Xpilot-AI Google Code Page - Work of the Xpilot-AI 2011 Team, who wrote up this informative wiki.