These are Quake 2 console commands. (to go to console press ~ )

give all - All Stuff

give health - 100% Health

give weapons - All Guns

give ammo - All Ammo

give armor - 200 Armor

give body armor - +1 Body Armor

god - God Mode

notarget - Invisibility

noclip - Clipping Mode

And These:

give jacket armor

give blaster

give shotgun

give super shotgun

give machinegun

give chaingun

give grenade launcher

give rocket launcher

give railgun

give bfg10k

give shells

give bullets

give cells

give grenades

give rockets

give slugs

give quad damage

give invulnerability

give silencer

give rebreather

give environment suit

give ancient head

give adrenaline

give bandolier

give ammo pack

give data cd

give power cube

give pyramid key

give data spinner

Some Extra:

give airstrike marker

give blue key

give red key

give security pass

give commander's head

give power shield

give armor shard

give combat armor