Ultima Underworld is a classic 3D dungeon crawler presented by Origin in 1993. It is currently free for download and may be emulated with DOSBOX (just be sure to press Ctrl+F12 plenty of times before playing for maximum game quality and responsiveness.)
This app translates the magical rune stones from your rune bag into spells. It is more convenient than just looking at the manual because it filters out spells that the user can't cast yet. The full spell list may be viewed when all the runes are selected.