Security software is a real free-for-all these days.
Sure a few strings might come attached -- some free anti-virus software and online scanners are strictly for personal use and you might need to put up with vendors regularly enticing you to upgrade for more security bells and whistles. But free and open source tools - from vulnerability assessors to packet analyzers to troubleshooting software -- can be had, and even the hackers trying to break into your network are fond of many of them.
This story, "Is there free stuff for online security? Yes!" was originally published by Network World.