AutoMeKin is an automated reaction discovery tool.
This web server allows you to unravel the reaction mechanisms (with intermediates and transition states) of your system, just providing an equilibrium structure (reactant). As a bonus, you will also obtain kinetics results at the desired temperature or energy.
Information on how to use this server can be found in Tutorial. Additionally, you can install and run AutoMeKin locally in your own machine, and instructions on how to do so are given in the Wiki.