Console Games:
Game Genie - NES rom
Dos Games:
Game Wizard 32 Demo - Memory Scanner
Doom 1 Shareware
Warcraft 2 Demo
Hiew 6.50 Free - Dos Hex Editor
Windows Games:
MHS (Memory Hacking Software) - Memory Scanner
Diablo 1 Shareware
Starcraft 1 Demo
OllyDbg - Debugger
Kartograph - Defcon 18 video: http://www.youtube.com/watch?v=jLMWCGgzmkQ
POL - Ultima Online Server Emulator
Ultima Online - Game Client
W32Dasm - Disassembler
Hex-Ed - Windows Hex Editor
iPhone / iPad Games:
iExplorer
mitmproxy - traffic sniffer
IDA Pro Demo - Decompiler
0xED - Mac Hex Editor