Crossbar.io

Crossbar.io is an open-source networking platform for distributed and microservice applications. It implements the Web Application Messaging Protocol, which allows application components to communicate through routed remote procedure calls and publish-subscribe messaging. The platform is designed to handle the messaging layer so developers can focus on business logic instead of building custom connection, routing, and event systems. It supports real-time application architectures where services, browsers, devices, and backend components need to exchange messages reliably. Crossbar.io is especially useful for event-driven systems, IoT backends, dashboards, collaborative applications, and distributed service environments. It can be deployed as a router in the middle of an application network and used with compatible WAMP client libraries.