libbats is a C++ RoboCup 3D Soccer Simulation agent base library. It includes everything to quickly set up a team for the RoboCup 3D SSL, including communication with the SimSpark RCSSServer3D simulation server, integration of data into easy to use models (i.e. localization, agent state, world state, etc.), debugging (RoboViz interface, and 2D GTK debugger), gait generation, math utilities, extensive documentation and an advanced example agent.