- Total Commander by Ghisler. I think the best file manager avalable. Includes file compare, synchronize directories, a perfect FTP-client and much more.
- IrfanView by Irfan Skiljan, a very handy picture viewer with several handy tools.
- PuTTY is a very handy free Win32 Telnet/SSH client that you do not need to install.
- 7-ZIP is a very handy free program to unpack and pack ZIP-Archives.
Guess there will be more to add to this list.
Please let me know if you encounter any broken links.