1. Console commands (# - number, [] - optional)

Console:
  dump [filename] - save console dump to file
  echo [текст] - show text in console
  date - show date in console
  time - show time in console
  commands - a commands list
  showhistory - shows commands history
  clearhistory - clears commands history
  clear - clears console

Players
  p1_name Stalin - first player is named Stalin now.
  p1_color 255 0 0 - color of first player will be red (RGB, 0-255)
  p2_name Lenin - second player is named Lenin now.
  p2_color 255 255 255 - color of first player will be white (RGB)

HUD
  g_showtime 1 - show clock (1-0)
  g_showfps 1 - show FPS meter (1-0)
  g_showgoals 1 - show team goals (1-0)
  g_showstat 1 - show statistic: your place and the gap between the players (1-0)
  g_showkillmsg 1 - show messages like "Vasya is killed by Petya"(1-0)

Game
  fraglimit # - Frag limit is # frags.
  map doom2d.wad map02 - runs map map02 from doom2d.wad. you can also write: map lift
                         it's equal to command: map lift.wad map01

  restart - restart game
  endgame - finish game
  pause - pause 
  exit, quit - 10000 bullets and god mode ;)
  
Bots
  Default skill is 3.
  addbot #, bot_add # - will spawn bot with skill # (1-3)
  bot_addred #  - will spawn red team bot with skill # (1-3)
  bot_addblue #  - will spawn blue team bot with skill # (1-3)
  bot_addlist name|num [red|blue] - add bot from botlist
  bot_removeall - kicks all bots

You can use PgUp/PgDn and Home/End in console.
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2. Editor hot keys

Mouse1 - drawing panels, triggers, creating objects, using Mini-Map

Mouse2 - selecting objects (including panel/lift selecting for triggers), 
      moving objects, scaling panels.

Ctrl+Mouse2 - selecting few objects

Shift+Mouse1 - moving objects around walls
            (e.g. for placing items precisely on floor)

Del - deleting object

Esc - deselect

Gray 4,8,6,5 - moving the object by grid spacing, e.g. 16 pixels.

Alt+Серые 4,8,6,5 - moving the object by 1 pixel

W,A,S,D - moving field of view

Ctrl+Tab - switching tabs (panels, objects, etc)
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3. Especially for those who have enough patience to finish reading... 
   CHEATS.

type "echo ololo" in console for turning cheats on.

Now type just in game:
RAMBO - all weapons, all keys, 30000 bullets
TANK - megasphere effect, 200/200
IDDQD - ???
BULLFROG - jump like a frog
FORMULA1 - run like a hell
GOODBYE - go to next level
CBVCBV - opens all doors in a level for 5 secs.
UJHTW - god mode
<TKSQJHTK - jetpack
GJITKYF## - go to map##
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Quick and dirty translated by Jabberwock.