Recon-ng is a full-featured Web Reconnaissance framework written in Python. Recon-ng has a look and feel similar to the Metasploit Framework, reducing the learning curve for leveraging the framework.

Complete with independent modules, database interaction, built in convenience functions, interactive help, and command completion, Recon-ng provides a powerful environment in which open source web-based reconnaissance can be conducted quickly and thoroughly.

If you want to exploit, use the Metasploit Framework. If you want to Social Engineer, us the Social Engineer Toolkit. If you want to conduct reconnaissance, use Recon-ng!

How to use ? Complete Guide is available here