Eclipse Vert.x channel! Don't ping just ask.
Netty project - an event-driven asynchronous network application framework
Icicle is a PHP library for writing asynchronous code using synchronous coding techniques
Tufão asynchronous web framework for C++/Qt | development and discussion | Mirror irc://irc.freenode.net/#tufao
A powerful templating engine with inheritance, asynchronous control, and more (jinja2 inspired)
ImageLoader is an instrument for asynchronous image loading.
A simple, easy to use asynchronous messaging framework for .NET
framed sockets library. provides asynchronous communication over tcp with power of libev
A solid, completely asynchronous and strictly RFC conforming XMPP implementation in F#.
A reactive, non-blocking, asynchronous driver for MongoDB
meinheld is a high performance asynchronous WSGI Web Server (based on picoev)
ImageLoader is an instrument for asynchronous image loading
An asynchronous callback's flow controller, chaining async function callbacks. Async methods calling flow make easy.
NetClient is library containing the abstractions and fundamental types to support a generic and asynchronous service API client.
An asynchronous REST API client that allows you to make API calls using LINQ syntax.