AVG has added security software for Apple's Mac operating system to its range of products for Microsoft Windows, Linux and Unix-based FreeBSD.
LinkScanner for Mac is the first AVG product designed for Mac OS X Leopard or Snow Leopard that is available for free download.
The product also supports the Apple's Safari internet browser versions 3 to 5 and Mozilla's Firefox 3 and higher.
"Mac users have traditionally been less vulnerable to attacks because of their lower market share, but that is quickly changing," said JR Smith, chief executive at AVG Technologies.
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No operating system is immune as attacks are increasingly using legitimate websites to deliver malware that targets web browser and application vulnerabilities, he said.
Some 99% of all malicious threats are delivered through the web and cannot be stopped with traditional anti-virus software, AVG research has shown.
"Because AVG believes strongly that security software like LinkScanner is critical, we believe it should be free," said Smith.