Immunity CANVAS is described as 'Immunity's CANVAS makes available hundreds of exploits, an automated exploitation system, and a comprehensive, reliable exploit development framework to penetration testers and security professionals worldwide' and is an app in the Security & Privacy category. There are more than 10 alternatives to Immunity CANVAS for a variety of platforms, including Linux, Windows, Mac, Online / Web-based and Self-Hosted solutions. The best alternative is Metasploit. It's not free, so if you're looking for a free alternative, you could try Censys or Armitage. Other great apps like Immunity CANVAS are Social-Engineer Toolkit (Free, Open Source), ZoomEye (Freemium), Exploit Pack (Free, Open Source) and Cobalt Strike (Paid).