free software for MS Windows

I prefer to avoid MS Windows though I occasionally investigate solutions to help friends who do use it. Here are the results. If you think this list should be modified, please send suggestions to: help!

These programs should be:


Firefox
web browser; faster and more secure than Internet Explorer
Thunderbird
e-mail client; easily imports settings from Outlook and Outlook Express
K9
spam filter; adaptive (it learns), and it works with any email client including Outlook and Outlook Express
IrfanView
image viewer
Miranda
instant messenging client; supports many services/protocols
SyncBack
backup and synchronize files and folders
SequoiaView | WinDirStat
disk usage visualisation utilizing treemaps
7-Zip
archive file utility (supports many formats including zip)
ClamWin
anti-virus tools
Spychecker
spyware/firewall software directory; remove spyware and other digital infections (if nothing else, use Spybot-S&D)
WinSCP
FTP/SFTP/SCP client
PuTTY
SSH client
TightVNC | RealVNC
VNC client & server
TinyApps.Org
software directory of very small/fast/efficient programs (mostly free)