Ignition Gazebo is an open source robotics simulator. Through Ignition Gazebo users have access to high fidelity physics, rendering, and sensor models. Additionally, users and developers have multiple points of entry to simulation including a graphical user interface, plugins, and asynchronous message passing and services. Ignition Gazebo is derived from Gazebo, and represents over 16 years of development and experience in robotics and simulation. This library is part of the Ignition Robotics project.