Available as an installable PHP package or as a virtual appliance. FreeNATS is a product that is in the stable beta stage. FreeNATS allows you to test your network and generate reporting to give you a bird's eye view of what is happening in your organization. Now, this is not a complete "enterprise" solution but it has the base features needed for the SMB to create scheduled and on-demand tests of the "mission critical" network applications and protocols. Plus you can't beat the price -- FreeNATS is free and of course, it is also cross-platform. This product is being actively improved upon through user feedback and continues to add testing functions. Download and test drive this software. I've really found it to be a great tool to help automate a testing environment.
Ron Barrett has been a technology professional for over a decade, working for several major financial firms and dotcoms. Barrett is a specialist in network infrastructure, security and IT management Ron is also the author of several books including: Office Communications Server 2007 R2: How-To , Windows Server 2008: How-To and The Administrator’s Guide to Microsoft Office 2007 Servers. Ron has been a co-author or technical editor for several other books on Windows administration. Along with book writing, Ron has contributed to several industry magazines such as Redmond, Datamation and Windows IT Pro. Beyond writing, Ron has spoken at several technology conferences for CPAmerica, AICPA and TECHMENTOR.