Counter-Strike - Source

Cheatmode:
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Submitted by: RM

During gameplay, press ~ to display the text prompt and 
type in sv_cheats 1. Press ~ and enter one of the following cheat. 

Result                                              Code 
--------------------------------------------------------
Spawn indicated item                              - give [name]  
Ammunition for weapons                            - impuse 101  
Toggle bot AI                                     - bot_stop [0 or 1]  
Allow bot to join game for indicated team         - bot_add_ct or bot_add_t  
Kill all bots                                     - bot_kill  
Toggle bot using pistols only                     - bot_pistols_only [0 or 1]  
Toggle bot using snipers only                     - bot_snipers_only [0 or 1]  
Bot automatically follows you if you do not 
give them orders                                  - bot_auto_follow  
Bots will not do mission objectives and will 
expect humans to do it                            - bot_defer_to_human 1  
Kick all bots from game and leaves humans to play - bot_kick  
Bots use only knives                              - bot_knives_only  
Bots have a prefix in their name                  - bot_prefix [prefix]  
See where bot is going                            - bot_show_nav  
Weapon hits nearest enemy                         - sv_clienttrace 99999999999