PuTTY is a free and open-source terminal emulator, serial console, and network file transfer application. It supports several network protocols, including SCP, SSH, Telnet, rlogin, and raw socket connection. http://www.putty.org/
I have tried to put together a helpful list of great downloads.
I highly recommend this opensource secure file program is great for moving files between servers. http://winscp.net/eng/download.php
VLC media player is simply the best multi-format video media player. VLC can also rip DVDs to MP4. http://www.videolan.org/vlc/download-windows.html
The perfect music player. I have enjoyed this cool easy to use music player to play my mp3 files without all the extra crap from iTunes. http://www.foobar2000.org/