Hamachi will allow you to establish secure direct connections to PC's that are not accessible otherwise due to the restrictions in network setup.
LanTopolog is an application that provides physical network topology discovery, visualization and monitoring.
ChrisPC DNS Switch
NetSetMan is a network settings manager which can easily switch between 6 different, visually structured profiles. Pre-prescribing network settings, you no longer have to write them again when you change your network connection (for example, when you connect your home computer at work, in cafes, or frequent switching between providers).
LanHelper can scan network at high speed and it can even detect writable or read-only shared folders with the powerful and special engine. Boot (wake up) or shut down or lock your PCs.
MediaCoder is a free audio/video batch transcoder, putting together many excellent audio/video softwares from the open source community into one friendly GUI.
SmartFTP allows you to transfer files across the Internet. Features include SSL (Implicit/Explicit), FXP Support, Multiple connections, Proxy Firewall support, Drag and Drop from Explorer, and Remote Directory caching.
CCleaner(formerly Crap Cleaner) is a freeware system optimization and privacy tool. It removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space.
KMPlayer is an excellent video and audio player which can play a large amount of formats such as VCD, DVD, AVI, MPEG-1/2/4, WMV, RealMedia, and QuickTime among others.
AnyDVD is a driver, which descrambles DVD-Movies automatically in the background. This DVD appears unprotected and region code free for all applications and the Windows operating system as well.