Sn1per Professional is described as 'version 8.0 is XeroSecurity’s automated offensive security framework for professional penetration testers, bug bounty researchers and enterprise security teams'. There are more than 10 alternatives to Sn1per Professional for a variety of platforms, including Linux, Windows, Mac, Python and Online / Web-based. The best alternative is Metasploit. It's not free, so if you're looking for a free alternative, you could try Armitage or Censys. Other great apps like Sn1per Professional are Social-Engineer Toolkit (Free, Open Source), ZoomEye (Freemium), Exploit Pack (Free, Open Source) and Cobalt Strike (Paid).
The Social-Engineer Toolkit is an open source penetration testing framework designed for social engineering. SET has a number of custom attack vectors that allow you to make a believable attack quickly.
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.