VMware
Yes, both Nessus and VAppSpy offer a Free Trial.
Nessus is designed for Large Enterprises, Medium Business and Small Business.
VAppSpy is designed for Individuals, Large Enterprises, Medium Business and Small Business.
The starting price of Nessus begins at $2,790/Year, while pricing details for VAppSpy 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 VAppSpy includes SafeSAI, ImmuniWeb, Qualys VM, GoDaddy Website Security, Barracuda Website Vulnerability Manager, Detectify, Web Application Security Assessment, ThreatSpy, VCodeSpy and Qualys Cloud Platform.