You can spawn stuff too...I'll post the NPC stuff for now, and I'll get the normal props up later.
NPC Spawns:
Hit tilde “~” and type "npc_create npc_ [name]” to spawn an NPC. Here is a list of the names you can enter for [name]
"alyx" (Alyx Vance)
"barney" (Barney Calhoun)
"dog" (Dog)
"kleiner" (Dr. Kleiner)
"eli" (Eli Vance)
"mossman" (Judith Mossman)
"monk" (Father Grigori)
"citizen" (Citizen)
"headcrab" (Regular Headcrab)
"zombie" (Regular Zombie)
"zombie_torso" (Regular Zombie Torso)
"headcrab_fast" (Fast Headcrab)
"headcrab_black" (Black Headcrab)
"headcrab_poison" (Poison Headcrab)
"fastzombie" (Fast Zombie)
"poisonzombie" (Poison Zombie)
"antlion" (Antlion)
"antlionguard" (Antlion Guard)
"combine_s" (Combine Soldier/Combine Elite/Prison Guard)
"metropolice" (Metro Cop)
"stalker" (Stalker)
"cscanner" (City Scanner)
"manhack" (Manhack)
"rollermine" (Rollermine)
"combine_mine" (Hopper Mine)
"combine_camera" (Combine Camera)
"turret_floor" (Combine Turret)
"turret_ceiling" (Ceiling Turret)
"turret_ground" (Ground Turret)
"launcher" (?)
"combinedropship" (Dropship)
"combinegunship" (Gunship)
"strider" (Strider)
"pigeon" (Pigeon)
"crow" (Crow)
"seagull" (Seagull)
"barnacle" (Barnacle)
"ichthyosaur" (Ichthyosaur)
"vortigaunt" (Vortigaunt)