Windows Tools:
Avast! Home Edition v5.0.89 Beta
CCleaner v2.23.993
Ad-Aware 2008 Free v8.0.7 Anniversary Edition
Spybot - Search & Destroy v1.6.2.46

PowerStrip v3.86

Fences v0.98

Media Tools:
VLC Media Player 1.0.1
BSplayer v2.43
Media Player Classic v6.4.9.1

Winamp Full v5.56

K-Lite Codec Pack Full v5.0.5
Subtitle Workshop v4.0 Beta 4

GIMP for Windows v2.6.7
IrfanView v4.25

Archive Tools:
WinRAR v3.90
7-Zip v9.06 Beta

Feel free to suggest other softwares to this list.