This one gets the thumbs-up on the basis of the name. It scans IP addresses and ports, returns NetBIOS information and detects Web servers. Anyone proficient in Java can write plug-ins to extend the functionality. It’s open source and free from creator Anton Keks. Download it here.

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Dave Webb
Dave Webb is a freelance editor and writer. A veteran journalist of more than 20 years' experience (15 of them in technology), he has held senior editorial positions with a number of technology publications. He was honoured with an Andersen Consulting Award for Excellence in Business Journalism in 2000, and several Canadian Online Publishing Awards as part of the ComputerWorld Canada team.