SpellBook is a Windows application developed by scorpio. It can calculate the mana cost of spells for Dungeon Master II, and also helps to calculate money.
Lets you select power level (Lo, Um, On, Ee, Pal, Mon)
Displays spells by class (Priest/Wizard) with their runes, effects, mana cost, and difficulty
Calculates total mana cost and difficulty based on selected power
Includes rune icons and potion flask visuals
Tooltips show rune descriptions and families
You can report bugs and make suggestions on the Dungeon Master Forums.