Janus is a platform designed to deal with the implementation and deployment of holonic and multi-agent systems. It is based on the CRIO organizational metamodel. The concepts of role and organization are supported as first-class entities. Janus provides a comprehensive set of features for developing, running, displaying, and monitoring multi-agent-based applications. The platform also natively manages the concept of recursive agents (holon or agents composed of agents). It can also run threaded and non-threaded agents without using the organizational and holonic API. It provides features equivalent to those of TinyMAS or MadKit.