Where Can I Find Free Software?

[Bugbatter]

Before downloading free software please read this Warning

Anti-Malware

• a² Free Windows XP/2003/2008 Server and Vista, limited functionality on x64
  
• BOClean Included in Comodo Internet Security. Windows For Workgroups 3.11 (Win32s required), Win 95/95A/95B/95C (Winsock 2 required), Win 98/98SE/ME/NT4 (SP2+ required)/2k/Server 2003/XP (any, including 64)/ Longhorn Server/Vista (any, including 64)
  
• Malwarebytes' Anti-Malware Windows 2k/XP/Vista (32-bit only).

Anti-Spyware/Adware

• Ad-Aware Free Windows 2k/XP(32-bit)/Vista(32- and 64-bit)
  
• Spybot - Search & Destroy©® Windows 95/98/Me/NT/2k/XP/Vista
  
• SUPERAntiSpyware Windows 2k/XP/2003 Server/Vista/2008 Server
  
• Windows Defender
  Windows Defender is included with all versions of Windows Vista and is available to download for genuine copies of Windows XP Service Pack 2 or later, or Windows Server 2003 Service Pack 1 or later...for Windows 2k/XP/2003 Server/...64 bit, click Here

Anti-Virus

• avast! Home Edition Windows 95/98/Me/NT/2k/XP/Vista...64 bit click Here
  
• AVG Anti-Virus Free Edition The AVG "Security Bar" includes the Yahoo toolbar. If you DO NOT WANT it, be sure to uncheck the option when presented during the installation... Windows 2k/XP/Vista
  
• Avira AntiVir Personal Windows 2k/XP/Vista...64 bit support for XP and Vista
  
• ClamWin Free...Windows All
  
• ThreatFire Windows 2000/XP/Vista

Firewall

• Comodo Internet Security Release Date: 1 February, 2010/Version 3.14.130099.587...Includes AntiVirus and Anti-Malware.
  
  Caution...Comodo's Toolbar, now named HopSurf, is affiliated with "Ask.com"...By installing this toolbar, you grant Comodo permission to collect information about your Internet usage. Read the HopSurf EULA. If YOU DONT WANT IT be sure to remove the check from the box when presented during the installation. Release Notes...32 and 64-bit Windows XP (SP2)/Vista/Windows 7
  
• Sunbelt Personal Firewall Release Date: November 2008/Version: 4.6.1861 Windows XP/Vista
  
• Online Armor Personal Firewall (Help Forum) Release Date: 2009-05-27/Version 3.5.0.14 Beta Windows XP, Vista, (32 bit only)
  
• Agnitum Outpost Firewall Free 2009 Release Date: 2009-05-02 Windows 2003, Windows Vista, Windows XP
  
• ZoneAlarm Free Version Release Date: 30 March 2009/Version 8.0.298.0...The ZoneAlarm Spy Blocker toolbar is powered by "Ask.com". The "Ask" search engine will cause "targeted" ads to be presented to you based upon the content of the web pages you visit, any personally identifiable information you have provided to "Ask.com", or keywords appearing in your search queries. Many security experts consider this type of behavior offensive...Windows 2k/XP/Vista

On Demand Scans

• BitDefender 10 Free Edition Windows 9x/2k/XP...Supports Windows Vista/XP 64 bit in beta release
  
• Dr.Web® CureIt! Windows All including 64 bit XP/Vista
  
• Kaspersky Virus Removal Tool Windows 2k (Service Pack 4 or higher)/XP home and pro (Service Pack 2 or higher)/Vista home basic, premium, business, enterprise, ultimate 32 bit only
  
• Malicious Software Removal Tool Windows Vista/XP/2k/Windows Server 2003...For XP and Vista 64 bit version, click Here
  
• McAfee® Avert Stinger Windows 2k/ME/XP
  
• MicroWorld Free AntiVirus Toolkit Utility (MWAV) MWAV 9.x is now compatible with Microsoft Windows Vista & 64-bit OS
  
• Norton Security Scan! Windows All
  
• ThreatExpert Memory Scanner (TEMS) Windows Vista 32-bit/XP/2k

Online Scans

• Full System Scans
  • BitDefender Windows 2k/2003/98/Me/NT/VISTA/XP
    
  • ESET Online Scanner Windows NT/2000/XP/Vista
    
  • F-Secure Vista and XP (Home and Professional), 32 bit only.
    
  • Kaspersky Online Scanner Will only list infections found...Windows 2k Professional SP4/XP SP2 32 bit and 64 bit/Vista 32 bit and 64 bit
    
  • Panda Active Scan Will only remove Viruses Worms and Trojans...Windows 95/98/Me/NT/2k/XP/Vista
    
  • Trend Micro HouseCall Microsoft Windows SP6a/2000,SP2/XP,SP1/2003, Vista and Windows MCE 2005/Linux Distributions that supports libc6/Solaris 2.6 and above
    
  • Windows OneCare OneCare customers will be able to migrate to a free anti-malware service codenamed 'Morro' when that product is ready for release in the second half of this year...Windows XP (SP2)/Vista
    
• Individual File Scans
  • Jotti's File Scan
    
  • Kaspersky File Scan
    
  • VirScan File Scanner
    
  • VirusTotal
    

Testing/Certification Web Sites:

• Anti-Malware Test Lab
  
• AV-Comparatives
  
• AV-Test.org
  
• F-Secure Health Check Requires Internet Explorer
  
• Malware Threat Center Most Effective Antivirus Tools Against New Malware Binaries
  
• Microsoft Baseline Security Analyzer 2.1 Windows All
  
• PC Pitstop Windows All
  
• Secunia Online Software Inspector ...or Download it Here Windows XP SP2 or later/2k SP4/2003/Vista
  
• ShieldsUp! Windows All
  
• Virus Total Real Time Stats (Infected Files Last 24 Hours)

List courtesy of 1972vet. Thank you!