The Open Software and Equipment Architecture (OpenSEA) is an open source software library developed and maintained by the unmanned vehicle community. It is a comprehensive library of sensor and actuator interfaces, protocols, control algorithms, intelligence structures, and file management utilities, and hardware interfaces common in the robotics and unmanned system community. OpenSEA is built on top of a comprehensive error-handling foundation that includes a flexible failure mitigating utility. OpenSEA is designed to encapsulate the core of an unmanned system in an attempt to provide commonality to the industry, a common interface to users, and a common architecture for developers. In cooperation with manufacturers, developers, and vendors, OpenSEA grows more capable and stronger all the time.