xSocket (2.8)
xSocket is an easy to use nio-based library to build high performance, high scalable network applications.

See:
Description

Packages

org.xsocket	Provides shared classes for nio-based network applications.
org.xsocket.connection	Provides classes to handle a connection-oriented, sequenced flow of data in a blocking or non-blocking mode on the server and on the client side.
org.xsocket.datagram	Provides classes to send or receive datagram packets in a unicast and multicast mode (one-to-many interaction) on the server and on the client side.

xSocket (2.8)
xSocket is an easy to use nio-based library to build high performance, high scalable network applications.