Eclipse Vert.x

Eclipse Vert.x is an asynchronous application platform for the modern web and enterprise.

• Vert.x has a very simple concurrency model. Vert.x allows you to write all your code as single threaded, this greatly simplifies development. (No more 'synchronized', 'volatile' or explicit locking).
• Vert.x includes a distributed event bus that spans the client and server side so your applications components can communicate incredibly easily. The event bus even penetrates into in-browser JavaScript allowing you to create effortless so-called 'real-time' web applications.
• Vert.x is modular. It provides a simple yet powerful module system, and a public module repository to encourage an ecosystem of modules published by the community.
• Vert.x takes advantage of the JVM and scales seamlessly over available cores without having to manually fork multiple servers and handle inter process communication between them.