While playing, drop the developer console via the TILDE key (next to numeric one). You may need to add a -dev or -devuser switch to the command or target line to the game executable via a Windows shortcut. All codes listed here are unverified.

help ... List available console commands
tgm ... Invulnerability
tcl ... Toggle clipping
lock ... Lock highlighted object with integer lock-level
unlock ... Unlock highlighted object
kill ... Kills highlighted entity (kills self if no target is selected)
modpcs , ... Add integer points to skillname skill
modpca , ... Add integer points to attribname attribute

Submitted by planetelderscrolllord
Verified by APY - PlanetElderScrolls, roxykittyd - PlanetElderScrolls