Complete Internet Repair does exactly what it says. It attempts to repair everything internet-related, including networking problems. Video tutorial and a portable version are also available.

With inSSIDer, you can inspect your Wi-Fi and surrounding networks, scan and filter hundreds of nearby access points, troubleshot the competing access points and clogged Wi-Fi channels, and more.

Simple Port Tester is a free program by PcWinTech.com to help users test if their ports are open with just a few clicks. Now supports 52 Languages. Portable version also available.

NxFilter is a freeware web filter designed for monitoring and filtering Internet activity within an enterprise environment.

Dns Jumper will increase the browsing speed or improve your security by replacing the DNS provided by your internet provider.