MrExcel.com

Information to help you learn how to use one of the world's most popular spreadsheet programs, Microsoft Excel. For those that prefer in person training, the site provides announcements of Excel seminars in the United States. You can also find other learning resources here to increase your ability to use Excel.

http://www.mrexcel.com/

Apache.org

The aim of the Apache HTTP Server Foundation is to develop a quality, open source HTTP (web) server. You can download the latest version of the server software here, and read documentation about Apache. The website also has information on how you can get involved in making Apache better.

http://www.apache.org/

Annoyances

A free web resource created by users of Microsoft Windows XP, 2000, Vista and other versions. Get your computer to run faster if it is slow, customize Windows to serve your needs or get tips to fix it if starts to misbehave. Discussion forums for every recent version of the operating system also provide a great place to ask questions.

http://www.annoyances.org/

Calculator.org

The website for Calc, a popular piece of calculator software, has everything you need from one of the world's most versatile computer calculators. The software is compatible with Windows personal computers and handheld devices. The program can be directly downloaded from the site.

http://www.calculator.org/

CalculatorCat.com

A directory of websites dedicated to all kinds of different calculators, to do both traditional mathematics and applications. The calculators available here are generally either stand-alone downloads or can be used as modules on websites.

http://www.calculatorcat.com/

Nonags.com

A safe website from which you can download a variety of free software including games, mp3 players, screensavers, backup tools, anti-spam tools and web browsers. All downloads are free from viruses and spyware. Members receive additional software, updates, true type fonts, and more.

http://www.nonags.com/

Open Source Initiative (OSI)

An organization that advocates the development of open source software. Learn about the Open Source Definition, how to obtain an open source license, and where the next open source event will be held. The site also provides a blog about the open source initiative.

http://www.opensource.org/

Viruslist.com

Viruslist is dedicated to eliminating computer viruses and helping you improve your Internet security. The virus encyclopedia and virus analysis will help you understand how viruses work. This website can also be accessed in German, French and Polish.

http://www.securelist.com/en/

Arachnoid

Arachnoid collects articles and opinions of subjects and has been online since 1996. This self-proclaimed "playground for thinkers" covers computing subjects such as Linux, Java, programming and so forth. There is also commentary on natural resources, science, psychology and so forth.

http://www.arachnoid.com/

Apple

The official website of Apple Inc. Shop online for Apple software including Mac OS, QuickTime, Microsoft Office for Mac, iLife, iWork, Adobe Dreamweaver and much more. The music program iTunes can be downloaded for free from this website. The site’s video tutorials and forums provide answers to FAQs.

http://www.apple.com/

Arizona Macintosh Users Group (AMUG)

AMUG is a non-profit corporation that offers education and assistance on computer use and technology to its members. The site's content includes advice on using Apple software, such as OS X, as well as information on the group's meetings.

http://www.amug.org/

LWN.net

Provides complete Linux information for the development community in a concise, well-written and objective manner. High quality articles inform readers of interesting developments that they may not have previously heard of.

http://lwn.net/

Opera

Offers free download of the Opera web browser for desktops, mobiles, set-top boxes, portable media players and other devices. Users can sign up for a blog service, share online photo albums and join the Opera forum. The website also offers online tutorials.

http://www.opera.com/

Layers Magazine

Layers Magazine is a how-to magazine for everything Adobe. The site has tutorials on how to use Adobe applications and reviews of new Adobe programs. The site also has job listings for those who are competent in Adobe programs. There are also forums where visitors to the site can share their opinions.

http://www.layersmagazine.com/

McAfee

McAfee is a major computer software company that specializes in providing security and anti-virus software to keep your computers safe. McAfee has products to suit all needs whether you are a home user or a large enterprise. The site's Threat Center has information on the latest viruses and what the company is doing to combat them.

http://www.mcafee.com/

Symantec

Symantec is one of the world's largest anti-virus and computer security companies. You can purchase a variety of security software here to protect your computer, email or even your business. You can also find news on the latest computer viruses and what the company is doing to combat them.

http://www.symantec.com/

Download.com

A worldwide popular website where you can download software and get all the latest software news. The site offers PC games and music, as well as a price comparison tool to help you find the best price on software products. You can also find mobile and mac software available for download.

http://download.cnet.com/windows/

Tucows Inc.

Provides a variety of Internet software for free. Tucows provides access to anti-virus scanners, web browsers, FTP clients and many other useful programs. The software available from this website will run on a variety of operating systems including Windows XP and Windows Vista.

http://www.tucows.com/