External Network Vulnerability Scanner

I am looking for suggestions for a free or low cost external network vulnerability scanner. I want to be able to scan the external IP addresses of a client and be able to produce a report that include open ports and security vulnerabilities such as Hearbleed.
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Leverage IT ConsultingAsked:
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Sean JacksonInformation Security AnalystCommented:
I would suggest two things --

OpenVAS for scanning, and hire a penetration tester to work with you to perform tests for your clients.
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