Linux Journal

Popular magazine that promotes Linux.

 Maverick Systems, Inc.

Local company that specializes in automation, controls, and machine vision.

 Mozilla

Organization that supports the popular Firefox and Thunderbird software projects.

 Multiple DNS Lookup

DNS lookup tool

 MX Toolbox

Various DNS and blacklist tools.

 Network Calculator

Useful network calculator tool.

 Network Utilities

Network utilities and calculator.

 NJABL

Not Just Another Bogus List blacklist service.

 O'Reilly

Essential source of open source, internet, and Linux reference material.

 Open Source Initiative

The Open Source Initiative (OSI) is a non-profit corporation formed to educate about and advocate for the benefits of open source and to build bridges among different constituencies in the open-source community.

 OSNews

Operating system and other various technology news.

 RealVNC

VNC remote control software for Windows.

 SANS

SysAdmin, Audit, Network, Security Institute

 Script Search

Programming directory of PHP, Javascript, etc. scripts.

 Scripts.com

Source of open source software.

 SearchSecurity

Security specific information resources for IT professionals.

 Security Focus

News about various security related topics.

 Slashdot

News for Nerds.

 Sophos

Provider of powerful antivirus solutions.

 SourceForge

Directory of open source software.

 SpeedTest

Internet speed test utility

 Thunderbird

Popular open source email client.

 Total Scripts

Directory of open source scripts and programs.

 US-CERT

U.S. Computer Emergency Readiness Team

 VirusTotal

Virustotal is a service that analyzes suspicious files and facilitates the quick detection of viruses, worms, trojans, and all kinds of malware detected by antivirus engines.