Raider

OWASP Raider was developed with the goal to improve web authentication testing. By now it has evolved and can be used for all kinds of stateful HTTP processes. It abstracts the client-server information exchange as a finite state machine. Each step comprises one request with inputs, one response with outputs, arbitrary actions to do on the response, and conditional links to other stages. Thus, a graph-like structure is created. Raider allows you to simulate complex systems while allowing you to control each piece of data you get in and out of the system.