Cheat Codes
During gameplay type www.freespace2.com, then hold ~ and press any of the following:

C = Send message to enemies
I = SelfInvulnerability
Shift 0 = Scroll backward through secondary weapons
R = Rearm targeted ship
Shift C = Toggle Availability of Countermeasures(All Ships)
K = Kill targeted Sguo
Shift I = Make targeted ship invulnerable for target
O = Make physics like Descent
Shift W = Infinite Weapons(All Ships)
Shift 9 = Scroll backward through secondary weapons(backward)
0 = Scroll forward through primary weapons
Shift K = Destroy targeted subsystem
Alt K = Do 10% damage to yourself
W = Infinite Weapons(Your Ship Only)
G = All primary goals complete
Shift G = All secondary goals complete
Alt G = All bonus goals complete
9 = Scroll through secondary weapons(forward)