Cheat mode:
Enter the Hacking engine in the game. Enter CHEAT.EXE and the cheat menu will be unlocked. Now enter the following codes:

0034AFFF    All weapons, Maximum firepower
1DDF2556    Unlimited ammo
69E5D9E4    Unlimited focus
FFF0020A    Fast focus restore
7F4DF451    Unlimited health
13D2C77F    Bonus test level
4516DF45    Enemies cannot hear you
FFFFFFF1    Enemies cannot see you
FF00001A    Turbo mode
D5C55D1E    Multi-player fighting
BB013FFF    Low gravity
7867F443    Faster logos
312MF451    Taxi Driving   

Various Phone Numbers
001-949-555-0112
001-714-555-0187
001-213-555-0142
001-310-555-0111
001-949-555-0101

Hacking Engine Tools:
In the Hacking engine (accessed from the title screen), there are a number of directories and tools that can be useful:

DIR <location>
List files and folders

CLS
Clear the screen of text

HELP <command>
Extended help for a command

TRACEKILL
Kills traces

READ
Read *.txt files

VIEW
View *.img files

PLAY
Play *.fmv files

DROP JXTRR10
Weapon drop at Drainage Canal

DROP PNSRZ10
Weapon drop at North Concourse

DROP RKHMS10
Weapon drop at Airport Tunneld

DROP JDZMT10
Weapon drop at 2nd Floor West (Chateau)

DROP ZKHBD10
Weapon drop at Courtyard (Chateau)

DROP RHFTQ10
Weapon drop at Skyscraper

DROP ZSZQH10
Weapon drop at Warehouse (Chinatown)

DROP JDHQL10
Weapon drop at Transformer Field (power plant)

DROP B1AXXF2
Weapon drop at 2nd Floor PO Boxes

Messages From Morpheus:
In the Hacking engine, instead of using GUEST, login as FREEMIND or COWBOYCURTIS to hear a message from Morpheus.

Thanks to Revolution readers Adelanto, WIZZ03BOY, Dylan, kyle, krazy_bob, Roms, Matt R., Admiral Raza, Mikael Jakobsson, Jeffrey Powers, D Alexander, Brannan Murphy, kieran gill, Phil, Dice_Meister, Gael Shaw, Niels Martlé, neofreak12, John Van Riper, Pelican Felon, Tina Chadwick, DARK_RAP, Sean "NightShadow", Bumbklaatt, Jamie Binge, Joe Winkler and sancho!