NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar
Activity Indicator - A HDD and SSD virtual LED program which can stay on system tray and display disk activity.
FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.
DiskLED - DiskLED is a flexible hard disk and general system activity indicator system tray applet.
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.