XeqTunnel is an HTTP tunneling package that makes Java client-server programming easier for applets and for applications. It can also be used to create wireless applications for high-end mobile phones, such as the Sony Ericsson P900. Only "one line of code" is needed to turn programs into distributed client-server applications.
OpenDMTP (Open Device Monitoring and Tracking Protocol) is a highly configurable and extensible protocol for communicating with mobile devices over high-latency/low-bandwidth networks. The protocol is particularly geared towards the transmission of GPS base location information and includes a full-featured reference implementation showcasing its capabilities.
iLabs mobile toolbox is a set of libraries and demo applications for Java ME. It includes libraries for XMPP, feed reading, and highly functional and fast, but limited, rendering of HTML with some CSS. The OpenMiniBrowser demo application shows some of the potential of the HTML renderer. It is intended to be embedded in other applications, but may also be used as a standalone browser. The toolbox also includes "the Widger": a HTML and XML based application that allows much of the application logic to reside on a server, while the user interface is a true Java ME application and not just Web pages.