Open the console by pressing [~] then type in:

 REB GOD                God mode
 REB INFINITE AMMO      Unlimited ammo
 NEXT LEVEL             Skip level + win current level

 GIVE [character's name] [item name]  Give item
 GIVE AND EQUIP [character's name] [item name]  Give and equip item

                        Item list:

                        Weapon:                 Best ammo:

                        LASER
                        BINARY_LASER
                        MAXIM_LASER             BATTERY_PLUS

                        PLASMA_PISTOL
                        PLASMATRIX
                        PLASMAGNUM              AUTOLOCK_BOLTS

                        GRENADE_LAUNCHER        GRENADE_PLUS
                                                GRENADE_EMP

                        MISSILE LAUNCHER        MISSILE_PLUS
                                                MISSILE_EMP

                        FLAMETHROWER            NAPALM

                        NANOFRAG
                        EPULSAR

                        Keys:

                        KEY
                        KEYB

                        Shields:

                        SHIELD_PICKUP
                        ARMOUOR_PICKUP

                        Body Slot Upgrade Pickup


                        AIM_ACCURACY_PICKUP
                        LOCK_DECODER
                        BEACON_TRACKER
                        TERRAIN_SCANNER
                        TERRAIN_SCANNER_WITH_RADAR
                        OMNI_SCANNER
                        HOLOGRAM_GENERATOR
                        AUDIO_CLOAK
                        SIGHT_PICKUP
                        SIGHTPLUS_PICKUP