NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
HDD Led Indicator - This is a hard disk activity monitoring tool.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
DriveGLEAM - DriveGleam is a free app that installs a handful of activity indicators as icons in your system...
NetTraffic - Essential network bandwidth monitor.
Atlas Hard Drive LED - Atlas Hard Drive LED is a system tray utility program that allows the user to always be aware of whether their hard drive is reading or writing. The system tray icon will change to the color red when the selected hard drive is processing.