Armitage is described as 'graphical cyber attack management tool for Metasploit that visualizes your targets, recommends exploits, and exposes the advanced capabilities of the framework' and is an app in the Security & Privacy category. There are more than 10 alternatives to Armitage 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 OpenVAS or Censys. Other great apps like Armitage are Nessus (Paid), Social-Engineer Toolkit (Free, Open Source), ZoomEye (Freemium) and Acunetix (Paid).
The Nessus vulnerability scanner is the world-leader in active scanners, featuring high-speed discovery, configuration auditing, asset profiling, sensitive data discovery and vulnerability analysis of your security posture.
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.