JSX serializes Java objects to XML. You can persist objects, evolve them, and send them over the network and between applications. Your object data becomes human-readable and human-writable. You can test it, search it, profile it, audit it, and edit it with ordinary text and XML tools. JSX handles all POJOs and also all classes that require Java's own object serialization.
Encdec encodes and decodes C objects such as integers, IEEE754 float and double values, times, and internationalized strings to and from popular binary formats and a wide variety of character encodings as they might appear in various file formats or network messages. It is compiled directly against the libiconv sources.
OpenEJB is a simple, lightweight Enterprise JavaBeans (EJB) container and server. You can embed OpenEJB in your own applications, or in a Web application server like Tomcat, or run it as a standalone EJB server. It supports EJB 3.0, 2.1, 2.0, and 1.1, and has partial support for EJB 3.1.
SCOP is a library for writing distributed applications. The functionality includes message-passing, events, and RPCs. It is primarily aimed at C++ programs on Linux, or Java anywhere. Much simpler than CORBA, it is easy to learn, general-purpose, fairly fast, thoroughly documented, complete, and free.
SwitchRMI is a framework for remote method invocation from Java that allows the client to choose from one of several RMI protocols. Objects can be made available over a number of transports; HTTP and SMTP are implemented. Any object vended can respond to an RMI request in any one of the supported protocols. Clients and servers can interact with third party implementations of supported protocols. New protocols and transports can be plugged in to the framework at runtime.
CarrierWave provides a set of facilities that automate and extend the EJB Value Object (or Data Transfer Object) pattern into supporting arbitrary value graphs. Specifically, CarrierWave provides a code generator that creates typed value objects from the source code of corresponding business objects, a client interface supporting the selection, modification, deletion, and invocation of business objects, and near-transparent business object persistence through various object persistence applications and interfaces like JDO.
Ice is a modern alternative to object middleware such as CORBA or COM/DCOM/COM+. It is easy to learn, yet provides a powerful network infrastructure for demanding technical applications. It features an object-oriented specification language, easy to use C++ and Java mappings, a highly efficient protocol (including protocol compression), asynchronous method invocation and dispatch, dynamic transport plug-ins, TCP/IP and UDP/IP support, SSL-based security, a firewall solution, and much more.