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Why spend thousands or even hundreds or thousands of dollars on a closed source application when you can get a comparable open source app for free? Even if you need commercial support, many open source programs now offer paid support that costs much less than the alternatives. For this list, we looked for quality, open source alternatives to software that has a reputation for being expensive. Whenever possible, we included MSRPs for the expensive software, though in some cases, the pricing scheme is so complicated that it’s nearly impossible to pin down. We published a similar list last year, and we’ve updated and expanded the list for 2011. If you have suggestions for next year’s list, feel free to note them in the comments section below. Accounting 1. Edoceo Imperium Replaces QuickBooks Pro ($229.95), Sage Peachtree Complete Accounting 2011 ($254.99) Web-based Imperium combines some business management features like CRM and job tracking with a full-feature...

1. Nmap Nmap (“Network Mapper”) is a free and open source (license) utility for network discovery and security auditing. Nmap uses raw IP packets in novel ways to determine what hosts are available on the network, what services (application name and version) those hosts are offering, what operating systems (and OS versions) they are running, what type of packet filters/firewalls are in use, and dozens of other characteristics. Nmap homepage . 2. Wireshark Wireshark is a network protocol analyzer. It lets you capture and interactively browse the traffic running on a computer network. Wireshark homepage . 3. Metasploit Community edition Metasploit Community Edition simplifies network discovery and vulnerability verification for specific exploits, increasing the effectiveness of vulnerability scanners. This helps prioritize remediation and eliminate false positives, providing true security risk intelligence. Metasploit community edition homepage . 4. Nikto2 Nikto is ...