I'm looking for a free or open source Network vulnerability scanner to check whether my office network has vulnerabilities and so on. Can someone list the best free Network vulnerability scanners?

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    Product recommendation questions are definitely off-topic on this site. – Deer Hunter Jan 17 '15 at 18:44

Nessus has a free home version which you can use. Or OpenVas, which is open-source may be able to help you.

However, dependant on the size and complexity of your network, it may be best to bite the bullet and actually pay for a system which can comprehensively scan your network.

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