Scribus is an open-source program that brings award-winning professional page layout to Linux/Unix, MacOS X, OS/2 and Windows desktops with a combination of "press-ready" output and new approaches to page layout.
The ESET Online Scanner is the Web's best free virus scan. A user-friendly, powerful tool, our online antivirus utility can remove malware—viruses, spyware, adware, worms, trojans, and more—from any PC utilizing only a web browser.
AVG Free is the most popular free solution available at no cost to home users and provides the high level of detection capability that millions of users around the world trust to protect their computers.
The above tools are free and work well, but here at Foresite we recommend ESET NOD32 AntiVirus as the second line of defense against viruses and malware, and then these other tools as a third choice, only when needed.
So what's the first line of defense? That's you. When you are on the Internet you are one step away from everyone else -- good and bad. Keep your wits about you, don't go where you shouldn't, and don't believe everything that pops up.