1)   BurnInTest Pro 5.0
BurnInTest is an easy to use software tool that simultaneously exercises all major components of a computer, to test for endurance and reliability. Tests include CPU, RAM, disk, video, CD/DVD, printer, serial, parallel, USB, tape and Network.

 2)   PassMark SoundCheck 3.0
PassMark SoundCheck is a Windows based application that allows users to test their PC sound card, speakers and microphone. Verify that your sound card can record and playback sounds at various audio sample rates.

 3)   ModemTest 1.3
ModemTest performs low level testing of dial up modems and telephone lines. Testing can be done with two modems or a single modem, independent of your ISP. ModemTest logs any data corruption and incorporates a modem speed test.