Mark Lefler and Jeff Mallett from Zillions Development have created a commercial program to play Christian Freeling's Grand Chess. Grand Chess is a popular large chess variant, invented by games designer Christian Freeling. This program allows you to play against the computer, and has many features. Two webpages give information on the program: one page of Mindsports - the site of Christian Freeling and Ed van Zon; and one page of Zillions Development - the site of programmers Mark Leflet and Jeff Mallett.
The program can no longer be obtained, end 2002. Grand Chess is now incorporated in Zillions of Games, version 2.