Additional materials for use with Castle Amber:
Mark of Amber is a tribute to Castle Amber set 30 years later. It is designed for use the AD&D 2e rules.
Classic Modules Today X2: Castle Amber is a conversion guide for using this module with D&D 5e rules.
Castle Amber is an expansion and conversion guide for D&D 5e.
Realistic Maps: Castle Amber provides a set of maps intended for use with virtual-tabletops.
Thorfinn Tait's website has color maps of Old Averoigne in the old Mystara maps style. There are two maps available, one at 8 miles per hex and another at 12 miles per hex.