Go to console and type :
Fat zombie: spawn monster_zombie_fat
"Yellow Jacket" Zombie: spawn monster_zombie_maint
Chaingun Zombie: spawn monster_zombie_commando_cgun
Tentacle Zombie: spawn monster_zombie_commando
Imp: spawn monster_demon_imp
Pinky Demon: spawn monster_demon_pinky
Trite demon: spawn monster_demon_trite
Maggot demon: spawn monster_demon_maggot
Hellknight demon: spawn monster_demon_hellknight
Tick demon: spawn monster_demon_tick
Arch-Vile demon: spawn monster_demon_archvile
Mancubus demon: spawn monster_demon_mancubus
Flying Cacodemon: spawn monster_flying_cacodemon
Pistol: spawn weapon_pistol
BFG 9000: spawn weapon_bfg
Shotgun: spawn weapon_shotgun
Chaingun: spawn weapon_chaingun
Machinegun: spawn weapon_machinegun
Rocket Launcher: spawn weapon_rocketlauncher
Plasma Rifle: spawn weapon_plasmagun
Soul Cube: spawn weapon_soulcube
Cyberdemon: spawn monster_boss_cyberdemon
Spawns a cherub: spawn monster_demon_cherub
Spawns an imp that starts out in crawling position: spawn monster_demon_imp_crawler
Spawns an imp in a weird position, doesnt move: spawn monster_demon_imp_crawl_armdoor
Spawns a revenant: spawn monster_demon_revenant
Spawns a lostsoul, sorta low to the ground: spawn monster_flying_lostsoul
Spawns a flaming Bernie zombie: spawn monster_zombie_bernie
Spawns a strong, boney zombie: spawn monster_zombie_boney
Spawns the hell boss, the Guardian: spawn monster_boss_guardian
Spawns the floating blue thing above the Guardian: spawn monster_boss_guardian_spawner
Spawns the Guardian's Seeker: spawn monster_boss_guardian_seeker
Spawns an immobile, untouchable, unremovable Maledict, the thing you see in the ending cinematic of the game. There is no point in this one: spawn monster_boss_maledict_cinematic
Spawns Sabaoth: spawn monster_boss_sabaoth
Spawns Vagary: spawn monster_boss_Vagary
spawns campbell holding his bfg case: spawn char_campbell_bfgcase
spawns the evil betruger: spawn char_betruger
spawns swann: spawn char_swann
spawns campbell holding...nothing!: spawn char_campbell
spawns a hazard suit scientist: spawn char_hazmat
spawns campbell holding bfg: spawn char_campbell_bfg
spawns a bloody spine: spawn env_gibs_spine
spawns a bloody human torso: spawn env_gibs_torso
spawns a bloody leg: spawn env_gibs_leftleg (or right)
spawns a bloody arm: spawn env_gibs_leftarm (or right)
chair: spawn moveable_chair (1,2 or 5)
table: spawn moveable_ktable
computer: spawn moveable_computer
base: spawn moveable_base_fixed
barrel: spawn moveable_base_barrel
domino: spawn moveable_base_domino
boulder: spawn moveable_base_boulder
open burger box: spawn moveable_burgerboxopen
closed burger box: spawn moveable_burgerboxclose
wad of paper: spawn moveable_paperwad
burger: spawn moveable_burger
base brick: spawn moveable_base_brick
wrench: spawn moveable_wrench
base: spawn moveable_base
canister: spawn moveable_cannister
laptop: spawn moveable_blaptop
carton: spawn moveable_cartonbox (1-8)
coke can: spawn moveable_cokecan
monitor: spawn moveable_monitor
gizmo: spawn moveable_gizmo (1-3)
weapons: spawn moveable_item_(any weapon here)
armed guard: spawn_marscity_marine_helmet_p90_walking
guard with a pistol: spawn_char_security_goggles_pistol
oxygen tank that explodes when shot: spawn_moveable_burningtank
oxygen tank that explodes when shot: spawn_moveable_explodingtank
highly explosive barrel: spawn_moveable_burningbarrel
explosive barrel: spawn_moveable_explodingbarrel