Ini Codes
Always make a backup copy before making any changes. Open up the file Baldur.ini with any text editor. Under the heading:

[Program Options]

Type:

Debug Mode=1

Start the game, and during gameplay, press Ctrl + Space to bring up the console. Now type any of the following:

CLUAConsole:SetCurrentXP(amount) - XP for selected character or group, cap is 2950000

CLUAConsole:AddGold(amount) - Gold

CLUAConsole:CreateCreature(monster) - Summon a Monster

Monster List
id - monster
wyvern01 - Wyvern
ogre01 - Ogre
uddrow27 - Drow Warrior
behgau01 - Gauth Beholder
beheld01 - Elder Orb Beholder
dragred - Red Dragon
dragblac - Black Dragon
dragsil - Silver Dragon
lich01 - Lich
trogi01 - Giant Troll
vammat01 - Mature Vampire
icmin01 - Minotaur
skelwa01 - Skeleton Warrior
icbone01 - Bone Golem
ghogr01 - Greater Ghoul
troluo01 - Splitter Troll
mumgre01 - Greater Mummy
golsto01 - Stone Golem
mistho01 - Mist Horror
hldemi - Demi Lich
orc05 - Orog Warrior
icsalcol - Blue Salamander
gendji01 - Djinni
mindfl01 - Mind Flayer

Max Stats
Enable Debug Mode. Then, when generating a character, press Ctrl + Shift + 8.

Heal and Jump
With Debug Mode enabled, press Ctrl + R to heal a character, and Ctrl + J to jump to the mouse cursor location.

Heal Party
When you have Debug Mode=1 in your baldur.ini file, you may use [CTRL] + T to move time forward.

Instant Kill
When you have Debug Mode=1 in your baldur.ini file, you may use [CTRL] + Y to kill the person or monster the cursor is on.

Other Cheats
When you have Debug Mode=1 in your baldur.ini file, you may use [CTRL] + 1 to change armor class of selected character. [CTRL] + 6 and [CTRL] + 7 to change the model of the selected char (prev and next, respectively).