Sin

Bring up the console by pressing the '~' key. Then enter these cheats.

/health 999             - full health
/wuss                   - all weapons
/superfuzz              - god mode
/nocollision            - no clipping
/noclip                 - no clipping
/wallflower             - enemy won't shoot at you
/give thrallgun         - secret weapon

/spawn heligun          - Gives chopper gun with unlimited ammo
/spawn magnum           - Gives the Magnum
/spawn shotgun          - Gives the Shotgun
/spawn assaultrifle     - Gives the Assaultrifle
/spawn rocketlauncher   - Gives the Rocketlauncher
/spawn sniperrifle      - Gives the Sniperrifle
/spawn reactiveshields  - Gives the ReactiveShield
/spawn rockets          - Gives Rockets
/spawn bluecard         - Gives Blue Identcard
/spawn orangecard       - Gives Orange Identcard
/spawn yellowcard       - Gives Yellow Identcard
/spawn greencard        - Gives Green Identcard
/spawn keyring          - Gives small key
/spawn moneybag         - Gives bag from bank robbery
/spawn evidence         - Gives papers with evidence
/spawn coin             - Gives a coin
/spawn health           - Gives a healthpack
/spawn cookies          - Gives a pack of cookies
/spawn lensflare        - Weird light-effect
/spawn silencer         - Gives a silencer for a standard gun
/spawn chemsuit         - Gives protection suit

/map intro              Over Freeport City Bank
/map bank               Freeport City Bank
/map abandon            Abandoned Freeport
/map csite              Construction Zone
/map subway             Abandoned Subway
/map chem1              Sintek Chemical Labs
/map chem2              Sintek Chemical Plant
/map whouse1            Sintek Warehouse
/map whouse2            Sintek Warehouse Part 2
/map biomecha           Biomech Factory
/map biomechb           Biomech Factory Part 2
/map silo               Missile Silo
/map sewera             Freeport Sewers
/map aq1                Freeport Aqueduct
/map sewerb             Freeport Sewers Part 2
/map dam                Freeport City Dam
/map wworks1            Freeport Water Works Part 1
/map wworks2            Freeport Water Works Part 2
/map oilrig             Sintek Oilrig
/map geo2               Geothermal Subtration
/map geo1               Geothermal Plant
/map uwpass1            Underwater Passage
/map uwpass2            Underwater Passage
/map docks1             Hidden Docks Part 1
/map docks2             Submarinal Cargo 5
/map jungle             Jungle Pass
/map jungle2            Jungle Pass Part 2
/map gorge              Mountain Gorge
/map area57             Area 57
/map biomass            Biomass Reclamation Center
/map xeno1              Xenomorphic Laboratory
/map xeno2              Xenomorphic Laboratory Part 2
/map mansion1           Estate Sinclair
/map mansion2           Estate Sinclaire Part 2
/map phoenix            Munt Phoenix
/map thrall             Thrall Master
/map training           Training
/map training1          Training
/map training2          Training
/map training3          Training
/map training4          Training
/map paradox            Bonus level