As this topic is not discussed because you can find them all easily, i feel that gathering the information here could be useful. These commands are widely known, but certainly there are users that don't know about their existence(especially for taskbar_hide + game_hideui() combo... because helps a lot at the time of taking screenshots :)).
To open console press Ctrl+Shift+~, to close it you need to press the same combination of keys again. When you have the console open, the game won't stop unless you hit pause before entering to the console.
The allowed functions are the following:
ee_bigheadmode(1) Big Head Mode, 1 for on, 0 for off
FOW_Toggle Toggles Fog of War on/off (still requires LoS for units)
FOW_RevealAll Turns the Fog of War off properly
setsimrate(4) Sets game speed (default is 8 )
taskbar_hide Hides the taskbar
taskbar_show Shows the taskbar
game_hideui() Hides units icons, grenade timers, etc.
game_showui() Shows units icons, grenade timers, etc.
restart Restarts the game
abortgame Quits the game
statgraph() Enables "statgraph_channel" codes
statgraph_channel("fps") Displays the frames per second
Misc_SuperScreenshot() Takes a screenshot without the taskbar, team colours or buttons visible,
even without the taskbar_hide command being used.
com_maxfps(X) Set frames per seconds to X. X must be a positive numerical value.
wb_orphan_nuke_texture For using on WorldBuilder. Removes all the textures left behind by
unselectable objects.
If you are using a non-english keyboard layout:
Use Ctrl+Shift+Ñ for spanish.
Use Strg+Umschalt+Ö or Strg+Umschalt+Ä for german.
Thanks to @Chancellor for sharing the game_hideui() parameter information and thanks to @Lethal Dosage from RelicNews Community for sharing his knowledge about this.
[Guide] LD's Guide to CoH for Dummies v2.6 (ToV info) (http://forums.relicnews.com/showthread.php?165976-Guide-LD-s-Guide-to-CoH-for-Dummies-v2.6-%28ToV-info%29)