Press ~ and enter "giftfrompterodon" to enable cheat mode. Now you can use one of the following codes:
Restore health: chtheal
Restore health for team: chthealteam
Weapon select: chtweap [0-30]
Refill ammunition: chtammo
Get grenades: chtgrenades
Access quickfights: chtallqf
Toggle third person view: cht3pv [0 or 1]
Toggle frame rate display: showfps [0 or 1]
Toggle stat display: showprof [0 or 1]