CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your on line activities such as your Internet history. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!

http://www.ccleaner.com

Advanced System Care can clean and optimize your computer.  

A Click A Day For PC Clean, Repair, Protection & Optimization

Advanced SystemCare Free (formerly Advanced WindowsCare Personal) has a one-click approach to helping protect, repair, clean, and optimize your PC. With over 20,000,000 downloads since 2006, this fantastic, award-winning, free program is a "must-have" tool for your computer, 100% safe and clean with no adware, spyware, or viruses.

Don't waste money on expensive "registry cleaners" to fix your PC when Advanced SystemCare Free will repair, tune, and maintain it for you!

http://www.iobit.com

Problems with the Windows registry are a common cause of Windows crashes and error messages.This cleaner tool allows you to fix your registry and optimize your PCs performance.With a few easy steps, you are able to find problems caused by invalid entries, references and links in the Windows registry and provides a list of the errors found, you can then choose to selectively repair each item or automatically repair them all.

Registry Repair is one of the safest Registry cleaning tools available in the market today. Its scanning engine is fast,thorough and safe.

Whenever you clean the Registry, a corresponding Undo file is generated for any changes made which can be used to recreate the entries deleted. You can restore any changes by clicking 'Restore previous repairs'. For added security,Registry Cleaner uses an 'ignore list' containing entries which when encountered upon while scanning are ignored.

The Cleaner tool will cleanup your Registry by finding

• Invalid paths
• Invalid file associations
• Invalid file types
• Invalid custom controls
• Obsolete software entries
• Dead file extensions
• Invalid application paths
• Invalid help paths
• Invalid fonts
• Obsolete start menu order
• Adwares and Spywares that use registry
• Invalid startup programs
• Invalid shared programs
• and all other dead entries through out the registry.

http://www.glarysoft.com/rr.html
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JkDefrag is a disk defragmenter and optimizer for Windows 2000/2003/XP/Vista/X64. Completely automatic and very easy to use, fast, low overhead, with several optimization strategies, and can handle floppies, USB disks, memory sticks, and anything else that looks like a disk to Windows. Included are a Windows version, a command line version (for scheduling by the task scheduler or for use from administrator scripts), a screen saver version, a DLL library (for use from programming languages), versions for Windows X64, and the complete sources.

Read the JkDefrag page in it's entirety and you will have one of the best defragmenters that I've seen AND you will re-gain the speed that your computer once had.

In my opinion it works better than Diskeeper, and it's FREE.  I use it on my computers once a week.

http://www.kessels.com/JkDefrag/index.html
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GNU Aspell is a Free and Open Source spell checker designed to eventually replace Ispell. It can either be used as a library or as an independent spell checker. Its main feature is that it does a superior job of suggesting possible replacements for a misspelled word than just about any other spell checker out there for the English language. Unlike Ispell, Aspell can also easily check documents in UTF-8 without having to use a special dictionary. Aspell will also do its best to respect the current locale setting. Other advantages over Ispell include support for using multiple dictionaries at once and intelligently handling personal dictionaries when more than one Aspell process is open at once.

http://aspell.net
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OpenOffice.org 3 is the leading open-source office software suite for word processing, spreadsheets, presentations, graphics, databases and more. It is available in many languages and works on all common computers. It stores all your data in an international open standard format and can also read and write files from other common office software packages. It can be downloaded and used completely free of charge for any purpose.

I use this program daily in my business.  It is a complete replacement for Microsoft Office.

http://www.openoffice.org
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Paint.NET is free image and photo editing software for computers that run Windows. It features an intuitive and innovative user interface with support for layers, unlimited undo, special effects, and a wide variety of useful and powerful tools. An active and growing on line community provides friendly help, tutorials, and plugins.

I use this program to make and edit all my graphics.  I like it better than any "pay for" software that I've ever used.

http://www.getpaint.net
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How to resize images : The VSO free image resize software organizes your photos by changing their resolution or moving them within your hard drive. VSO Image resizer is the perfect tool for those who store their digital pictures and images on their PC and who want to resize, compress, convert, create copies, create thumbnails, import or organize photos.
With this free resize image software, you can create e-mail friendly versions of your images, load them faster, move them easily from folder to folder, change their format, edit large numbers of image files/batch image resize and thus save space on your hard drive. Using high resolution 1600x1200 for creating wallpaper or file-sharing you can save your memory. VSO Image Resizer can also change file names using a template and you can add your own watermark with transparency support.
VSO Image resizer is integrated into the Windows explorer shell, right click on your pictures and start working on your pictures !

It's simple and works great.  I use it regularly.  You can do a batch re-size making it easy to thumbnail images for your website.

http://www.vso-software.fr/products/image_resizer
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OpenX is a hugely popular, free ad server designed by web publishers for web publishers. It provides everything you need to manage your on line advertising.
Make more money from on line advertising today.

OpenX gives you:

Control	Maximize your revenue by showing the right ad campaigns to the right people.
Transparency	Track the performance of all your on line advertising from one intuitive interface.
Freedom	Free to mix direct, network and house ads to optimize your revenue per page.

OpenX is open source software trusted by over 30,000 web publishers around the world. 

http://www.openx.org
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Piwik is an open source (GPL license) web analytics software. It gives interesting reports on your website visitors, your popular pages, the search engines keywords they used, the language they speak? and so much more.

piwik aims to be an open source alternative to Google Analytics.

piwik is different from the competition because:

1. the features are built inside plug ins: you can add new features and remove the ones you don?t need. If you are a developer, you can easily build your own plug ins!
2. you own your data. Piwik being installed on your server, the data is stored in your own database and you can get all the statistics using open APIs (publishing the data in many formats: xml, json, php, csv)
3. (NOW AVAILABLE!!!) the user interface is fully customizable, you can drag and drop the widgets you want to display, create the reports you want

http://piwik.org
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Jashsoft Cryptographer allows users to Encrypt their message or text using a Passkey/Password and send it through E-Mail. The recipient has to decrypt the code using the same Passkey/Password to read the message. This allows users to send vital data via E-Mail securely. So now there are no worries of sending Credit card numbers, PayPal account details, or Access codes through E-Mail. 

http://jashsoft.com/crypto.aspx
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Make your own ring tones and videos and send them to your phone with this cool software.  It allows you to edit audio and video clips.

What is ToneThis
ToneThis is a desktop application for delivering personalized and third-party content to your phone. Unlike traditional content stores (ringtones, wallpapers, videos, games), ToneThis sits on your desktop enabling you the freedom to select and personalize your own content for delivery to your cellphone.

Additionally, ToneThis allows you to purchase premium content (music, art, video, games) from the desktop application. With an install-base base of over 400K+ users with 15K+ downloads a week and with retail distribution worldwide in major stores (ie Fry's, Best Buy, CompUSA etc), ToneThis is the leading desktop channel for personal and premium mobile content.

http://www.tonethis.com
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GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

GIMP is written and developed under X11 on UNIX platforms. But basically the same code also runs on MS Windows and Mac OS X.

I use this all the time.  Most (if not all) the images on all my websites have be done with GIMP.

http://www.gimp.org
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Here is a list of Anti-Virus Software.  Some are free for personal use and some are free for commercial and personal use.  Most are pay software.  This is in no way an endorsement of any software.  

• AhnLab AhnLab V3 provides a safe desktop environment by protecting and removing viruses, worms, adwares, spywares, trojans, keyloggers, spybots, and other security threats.
• Antiy Labs A set of defense, killing, management, protection in one of the professional information security software.
• Aladdin eSafe provides real-time, intelligent inspection of all Web and mail traffic while offering the performance and scalability needed for your organization to stay flexible and productive.
• ALWIL avast! antivirus software provides complete virus protection for your computer. Antivirus engine is complemented by anti-spyware, firewall and antispam modules 
• Authentium Authentium develops software and services to protect consumers in a connected world.
• AVG Technologies AVG has led the world in free anti-virus protection for years. 110 million people around the globe rely on AVG to protect them while they?re online or offline. Threats today go way beyond viruses and only AVG adds the extra layers of protection against today?s biggest online threats.
• Avira Avira, a company with around 100 million customers and 300 employees is a worldwide leading supplier of self-developed security solutions for professional and private use. With more than 20 years of experience, the company is one of the pioneers in this field.
• Cat Computer Services Quick Heal Technologies is India?s leading provider of Internet Security tools and is a leader in Anti-Virus Technology in India. A privately held company, Quick Heal Technologies was founded in 1993 and has been actively involved in Research and Development of anti-virus software since then.
• ClamAV Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX, designed especially for e-mail scanning on mail gateways. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. The core of the package is an anti-virus engine available in a form of shared library.  Windows version available.
• Comodo  FREE DESKTOP PRODUCTS Award winning software covering a wide range of needs.
• CA Inc. CA provides the broadest portfolio of IT management products available from a single software manufacturer.  We supply cost-effective solutions to meet the complex needs of the largest enterprise companies, to protect and support small and medium businesses, and to provide safety and security for home PC users.
• Doctor Web, Ltd. Dr.Web Security Suite ? all you need to protect against viruses and spam.
• Emsi Software GmbH Keep your PC free from all internet dangers like viruses, worms, trojans, bots, spyware, adware and keyloggers with the technology of two major virus scanners!
• Eset Software ESET delivers the fastest, most effective antivirus software with spyware and malware protection available to combat viruses, spyware, rootkits and other Internet attacks, keeping your identity and data safe from hackers and thieves.
• Fortinet Fortinet's flagship FortiGate® security platforms offer a powerful blend of ASIC-accelerated performance, integrated multi-threat response, and constantly-updated, in-depth threat intelligence.
• FRISK Software  FRISK Software International, established in 1993, is one of the world's leading companies in antivirus research and product development.
• F-Secure F-Secure is the global leader in providing security as a service through operators.
• G DATA Software G Data Software AG is an innovative and rapidly expanding software house focusing on IT security solutions.
• Hacksoft The Hacker detects and removes any kind of malicious code, malware-known: E-mail worms, Trojans, Backdoors, spyware, adware, Dialers, Rootkits, 95/97/2000/XP/2003/2007 Office macro viruses, virus Scripts such as Visual Basic, JavaScript (VBS, PIF, SHS), including messages or embedded in HTML pages, Master Boot, boot sector, etc.
• Hauri HAURI, with a pride of top leading Korean security solution provider, produce and distribute its unique security solutions that protect our customers from diversified IT threats and help enterprises manage the risk.
• Ikarus Software IKARUS Security Software GmbH is an Austrian company in the software industry. His focus is on "Anti-virus and content security." Since its founding in 1986, IKARUS Security Software GmbH develops security solutions and was one of the first antivirus producers worldwide.
• INCA Internet INCA Internet is proud to be leading one of the most valuable industries, the information security field, for a bright present and rich future through innovational and original technologies.
• K7 Computing K7 Computing is an information security solutions company that protects individuals and organizations from IT threats such as viruses, malware, spyware and hacker attacks. Our vision is to make Computing Safe and Secure while keeping it Simple.
• Kaspersky Lab Our award-winning anti-malware technology continues to rack up the awards ? from the independent testing labs to product certifications to product reviews.
• McAfee VirusScan
• Microsoft Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
• Microsoft The Microsoft Malware Protection Center (MMPC) provides world class antimalware research and response capabilities that support Microsoft's range of security products and services. With laboratories in multiple locations around the globe the MMPC is able to respond quickly and effectively to new malicious and potentially unwanted software threats wherever and whenever they arise.
• Norman Norman ASA, founded in Oslo Norway in 1984, is a world leader and pioneer in proactive content security solutions and forensics malware tools. Millions of users rely on Norman's solutions, such as network security, endpoint protection solutions and malware analysis tools, to protect their values.
• Panda Security Panda Security is one of the world's leading creators and developers of technologies, antivirus and services for keeping clients' IT resources free from viruses and other computer threats at the lowest possible Total Cost of Ownership.
• PC Tools Award-winning spyware and virus protection to secure your PC against privacy, tracking and virus threats.
• Prevx Improve your PC security, even if you already have an antivirus or Internet Security suite installed. Prevx 3.0 with SafeOnline is the World's strongest, fastest, most powerful security solution for those who want to be safe online.
• Rising Antivirus Beijing Rising International Software Co.,Ltd.  was established in April 1998. Its predecessor, established in 1991, is Beijing Rising Computer Technology Development Department. RISING is one of the earliest enterprises engaged in computer virus prevention in the world. RISING is dedicated to the research, development, production and sale of computer antivirus products, network security products, and anti-hacker products. RISING possesses all the intellectual property rights and a number of patented technologies for all the products.
• Secure Computing McAfee has acquired Secure Computing, a global leader in enterprise security solutions. Secure Computing's award-winning solutions, powered by TrustedSource? technology, proactively protect mission-critical business applications from Internet-borne threats. The acquisition of Secure Computing extends McAfee's position as the industry leader in security risk management, with the most comprehensive and integrated endpoint, gateway, and hybrid security offerings.
• BitDefender GmbH BitDefender®is the creator of one of the industry's fastest and most effective lines of internationally certified security software.
• Sophos Our powerful solutions deploy easily, require minimal management and are simple to use. And all Sophos customers benefit from SophosLabs, the core of our expertise, which has the fastest response in the industry to emerging threats.
• Sunbelt Software Who is Sunbelt Software?  Sunbelt Software was founded in 1994 and is a fast-growing provider of endpoint and server-based security software for the enterprise, consumer and OEM markets. We protect millions of users globally against the rapidly evolving threat landscape.
  
• Symantec Symantec helps consumers and organizations secure and manage their information-driven world. Our software and services protect against more risks at more points, more completely and efficiently, enabling confidence wherever information is used or stored.
• VirusBlokAda The line of products produced by VirusBlokAda is based on the antivirus engine developed by our specialists. Vba32 Personal is recommended for home users. It's a reliable and, it is crucial, quick tool to detect and neutralize computer viruses, mail worms, trojan programs and other malware (backdoors, adware, spyware, etc) in real time and on-demand at computers running Windows.
• Trend Micro Since its inception in 1988, Trend Micro has continually delivered innovative technologies to create simplified yet sophisticated tools to protect users against known and unknown threats.
• VirusBuster With its over 15 years of experience, VirusBuster Ltd. has international reputation in the field of IT security. Based in Budapest, Hungary, the company delivers full-fledged anti-virus and other security solutions on all major platforms to its customers on five continents. Virusbuster?s software has been recognized with numerous prizes and certificates from many independent testing organizations. Its flagship product, VirusBuster Professional, has won several ?Virus Bulletin 100%? awards, ?Checkmark Anti-Virus Level One? and ?CheckVir? certifications. It received the ?Desktop/Server Anti-Virus Detection? certification, and, in 2007 and 2008, the ?Desktop/Server Anti-Virus Cleaning? certification from ICSA Labs.