Network Lights - Network Lights is a Windows program, which blinks keyboard LEDs (Light Emitting Diode) indicating outgoing and incoming network packets on network interface.
Beyond Compare - Beyond Compare allows you to compare files and folders.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.