Anti-malware and security suite vendors

• AVAST Software (avast!)
• AVG (formerly Grisoft)
• Agnitum (Outpost)
• AhnLab (V3Net)
• Aladdin (eSafe)
• ArcaBit (ArcaVir)
• Authentium (Command)
• Avira (AntiVir)
• BitDefender (formerly Softwin)
• Bullguard
• CA (Corporate)
• CA (Home user)
• Central Command (Vexira)
• Check Point (ZoneAlarm)
• ClamAV (open source)
• Comodo (BOClean)
• Coranti (Multicore)
• Cybersoft (VFind/VTSK)
• Doctor Web
• ESET (Nod32)
• Ewido
• F-Secure
• Filseclab (Twister)
• Fortinet
• Frisk Software (F-PROT)
• G DATA (AVK)
• Ggreat
• HAURI (ViRobot)
• IBM ISS (Proventia)
• Ikarus
• Intego (Mac specialist)
• Iolo
• K7 Computing
• Kaspersky Lab
• Kingsoft
• Lavasoft (AdAware)
• McAfee, Inc. (formerly Network Associates)
• MicroWorld Software (eScan)
• Microsoft (Forefront)
• Microsoft (OneCare)
• Moon Secure (open source AV for Windows project)
• New Technology Wave Inc. (VirusChaser)
• Norman Data Defense Systems
• PC Tools (Spyware Doctor)
• Panda Software
• Per Systems
• Proland Software (Protector Plus)
• ProtectMac (Mac specialist)
• Quick Heal Technologies
• Returnil (Virtual System)
• Rising
• SecureMac (MacScan)
• Sophos
• SpyBot - Search & Destroy
• Sunbelt Software (CounterSpy, Vipre)
• Symantec Corporation (Norton)
• Trend Micro Inc.
• Trustport
• VirusBlokAda (VBA32)
• VirusBuster Ltd.
• Webroot (Spy Sweeper)
• eEye Digital Security (Blink)

Email/spam/gateway specialists

• Barracuda Networks
• COMDOM Antispam
• Clearswift (MIMESweeper)
• Cyberoam
• GFI
• Ironport
• MailMarshal
• MailWasher
• Secure Computing (WebWasher/IronMail)
• SmoothWall (open source firewall project)
• Sonicwall
• Spam Agent
• Spam Assassin (open source spam filtering)
• Spam Bully
• SpamTitan
• Spamfighter
• Websense

Managed service providers

• BlackSpider
• Brightmail
• Commtouch Software
• Cyber Sentry
• Marshal Software
• MessageLabs
• NetCleanse
• Postini
• ScanSafe
• iCritical

Other security products and services

• Bit9 (application control)
• NetQin (mobile device security)
• PrevX (behavioural monitoring)
• Radialpoint (ISP security services)
• Sana Security (behavioural monitoring)
• Sandboxie (freeware browser sandbox)
• Secunia (vulnerability management)
• Snort (IDS/IPS)
• TippingPoint (IPS/NAC)
• Yoggie (hardware-based tools)
• iDefense Labs (vulnerability management)