[UPDATE Feb 24th 2018: tenable disabled the API to execute remote scan since version 7 so keep in mind that if you use nessus>7 this won’t work]
Metasploit is my favorite tool while I do Pen Test and Secuirty Checks. I use also Nessus for Vulnerability Assessment and integrate Nessus and Metasploit is a must.
Follow a short guide on how to launch Nessus from Metasploit (for reference, I used NESSUS 6.5 and Metasploit PRO but also Community Edition should be ok).
Scubarda 