Free or Open Source diagnostic tools for the x86 platform.

PC software diagnostics tools and utilities.

Manufacturers of PC diagnostic software products for PCs. Products include PC-Technician, PC-Diagnosys and The PC Toolbox Newsletter.

Software tools for SCSI/FC/iSCSI/SAS device configuration visualization and testing for Windows 2000/XP/2003/Vista that support manual/scripted execution and Medium Changer SCSI devices. Includes product catalog, order forms, news and FAQ.

ModemChk makes it easy to check the results of your last connection, for reconfiguring your modem, comparing results, and checking line noise. Click the auto detect button or use the command line options to open and run an AT command of your choice.

Software USB protocol analyzer that decodes the USB device descriptors and captures and analyzes I/O requests for USB devices in real time.

Diagnostic (tasks and memory) utility for Windows

Hardware and software tools for PC diagnostic and troubleshooting. Products include PHD, PCI, and QuickTech Pro.

Company develops innovative problem-solving software for pinpointing computer problems.

Health check, security erase and other tape tools for backup media for Windows. Offers product description, screenshots, demo, ordering info.