While playing, press ~ to bring up the console. 
Type player-> followed by one of the codes below. 

setflying 1			Flight mode 
setsuperjump 1			Super jumps 
setwaterwalking 1		Walk on water  
setwaterbreathing 1		Breathe underwater 
setlevel   		Set player level 
additem gold_100 	Add indicated amount of gold 
setfatigue 		Set maximum fatigue value 
setmagicka 		Set maximum magic value 
sethealth 		Set player health 
centeroncell 		Place character in the named cell 
coc 			" "   " "   " "   " " " "   " "
centeronexterior 		Place character in the exterior cell grid
coe 			" "   " "   " "   " " " "   " "
filljournal			Add all entries to journal  
fillmap				Show all the towns on full map 
fixmeJump			128 units away from current location  
help				Show shorthand for most commands   
showvars or sv			Show variables 
stopcelltest or sct		Stop cell test 
testcells or tc			Test cells  
testinteriorcells or tic	Test interior cells
testmodels or t3d		Test models 
toggleai or ta			Toggle AI 
toggleborders or tb		Toggle borders 
togglecombatstats or tcs  	Toggle combat statistics 
togglecollision or tcl  	Toggle collisions 
togglecollisionboxes or tcb  	Toggle collision boxes
togglecollisiongrid or tcg  	Toggle collision grid
toggledebugtext or tdt  	Toggle debug text
toggledialoguestats or tds  	Toggle dialogue statistics
togglefogofwar or tfow  	Toggle fog of war
togglefullhelp or tfh  		Show ownership and script name
togglegodmode or tgm  		Toggle God mode
togglegrid or tg  		Toggle grid
togglekillstats or tks  	Toggle kill statistics
toggleloadfade  		Toggle load fade
togglemagicstats or tms  	Toggle magic statistics
togglemenus or tm  		Toggle menus
togglescripts  			Toggle scripts
togglestats or tst  		Toggle stats
togglesky or ts  		Toggle sky
toggletexturestring or tts  	Toggle texture string
toggleworld or tw  		Toggle world
togglewireframe or twf  	Toggle wireframe 
display tpg  			Toggle path grid
members sg  			Show selected actor's group
showscenegraph or ssg		Show scene graph   
twa				Toggle water  
tvm				Toggle vanity mode   
tso				Toggle script output


by unknown