fairy-Max is a version of micro-Max  that reads the piece description
from a file fmax.ini, so that arbitrary fairy pieces can be implemen-
ted. This version supports up to 15 piece types, and board sizes upto
12x8 board. A Linux port exists in the format of a debian package.

You can use it e.g. with games/xboard/:
e.g.: xboard -boardSize Middling -variant courier -fcp fairymax

GIT: http://hgm.nubati.net/cgi-bin/gitweb.cgi/fairymax.git