VMware
Yes, both Nessus and Qualys VM offer a Free Trial.
Nessus is designed for Large Enterprises, Medium Business and Small Business.
Qualys VM is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Nessus begins at $2,790/Year, while pricing details for Qualys VM are unavailable.
Some top alternatives to Nessus includes Tenable.io, BeyondTrust Vulnerability Management, Qualys VM, Microsoft Threat Vulnerability Management, Flexera Software Vulnerability Management, ManageEngine Vulnerability Manager Plus, Unified VRM, Acunetix, Qualys Patch Management and Qualys Cloud Platform.
Some top alternatives to Qualys VM includes and undefined.