Cindy is a robust, scalable and efficient asynchronous I/O framework, supports TCP, SSL over TCP, UDP and Pipe. It's released under the Apache 2.0 License.
Features
Efficient TCP/UDP/Pipe communication
Flow control
Filter mechanism, such as SSLFilter/StatisticFilter/LogFilter
Active object pattern, support polling, blocking and callback
Pluggable memory management and dispatch strategy
Priority send support
JMX support
Easy configurable
Native asynchronous I/O support (planning)
Download
File releases can be downloaded from here, and source code can be checked out through anonymous(pserver) CVS. (Browse)