Following cheat codes have been implemented in VCMI:

vcmiistari - gives all spells and 999 mana to currently selected hero
vcmiainur - gives 5 Archangels to every empty slot of currently selected hero
vcmiangband - gives 10 black knight into each slot
vcmiarmenelos - build all buildings in currently selected town
vcminoldor - all war machines
vcminahar - 1000000 movement points
vcmiformenos - give resources (100 wood, ore and rare resources and 20000 gold)
vcmieagles - reveals FoW
vcmiglorfindel - advances currently selected hero to the next level
vcmisilmaril - player wins
vcmimelkor - player loses
vcmiforgeofnoldorking - Hero gets all artifacts except spell book, spell scrolls and war machines. This includes artifacts added via mods.

Console commands

autoskip - Toggles autoskip mode on and off. In this mode, player turns are automatically skipped and only AI moves. However, GUI is still present and allows to observe AI moves.
onlyai - When typed in pregame, it completely removed human players and GUI from game. Use console and bugtracker to test AI quickly. Additionally, game cna be launched with --onlyAI parameter to enable this mode by default.

Cheat codes