Tenable headquartered in Columbia offers Nessus, a vulnerability scanning and security assessment solution used to analyze an entity's security posture, vulnerability testing, and provide configuration assessments.
Nessus is the smallest product in the Tenable stable and is also the first vulnerability scanner to be created almost 20 years ago. Great tool for once off scans. But you need the other products if you want real time monitoring etc
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Chose Tenable Nessus
Comparing other products, Nessus has a lot of plus points. Not only for PCIDSS, Nessus is great for other compliance bodies such as HIPAA, NIST etc.
We looked at AlienVault since it can be a SIEM and scanner all in one. Ultimately, we decided AlienVault didn't stack up well against Nessus so we decided to purchase Nessus. Glad we did.
Sometimes when we identify a vulnerability with Nessus that has an exploit, we made a proof of concept with Metasploit in order to show to the IT managers the importance of the software/hardware hardening.
Nessus is standard vulnerabilities assessment tool, i would recommend for mid or higher level organization to have their personalised tool from Nessus for day to day managing of their network security with continuous improvements.