"A fantasy d20-themed dungeon crawler", to quote DarkGod's comment. Inspired by Incursion by Julian Mensch. Made available under Open Game License. This is a non-profit fan project. No money is made. There are currently only two people working on the mod. However, we have released several beta versions so far.
I fixed a problem two players reported with being unable to memorize 2nd level spells (and getting an error instead) as Wiz3. Added a check which might seem spurious but prevents similar errors in the future. I also improved the right-hand part of the screen to be more readable.
Why some spells are missing the charge numbers, I don't know, will look into it later. I suspect it has to do with their distance from the left hand border of the spellbook.