ozone is a transaction-based, object-oriented database management system completely implemented in Java and distributed under an open-source license. It aims to evolve a technology that allows developers to build pure object-oriented, Java database applications. ozone also contains a full-featured XML API that allows you to use it as an XML repository.
p-unit is a framework for unit testing and performance benchmarking. As a unit test, it can run with a single thread or multiple threads against the same test code. p-unit has an executor pool which can accelerate the execution speed dramatically. As a perforamnce test framework, it records memory consumption and execution time, and generates results in the form of plain text, image, and PDF file. Users can also easily register their own reporters by implementing the p-unit event listener.
The peaberry project is an extension library for Google-Guice that supports dependency injection of dynamic services. It provides OSGi integration out of the box, and has plug-in support for other registry-based service frameworks. It ships as an OSGi bundle that can be dropped into any R4 framework, such as Apache Felix or Eclipse/Equinox. You can also use peaberry outside of OSGi.
pkt is a universal XML packet archiver. It can manipulate files for backing up documents, transferring them across networks, emailing them, and sharing them by other means (p2p etc). It uses plugin filters to do the job and handles virtually any format available if there is a plugin for it. It handles encryption, compression, conversion, parity checking, decryption, decoding, repairing, rebuilding, and other tasks using a universal file format (XML-based). By default, all pkt output is in 7-bit ASCII which is UTF encoded and is compatible with XML parsers. pkt files can be disassembled, reassembled, and repaired by hand if necessary. pkt also supports the use of 8-bit compressed XML packets for its archives using one of several compression algorithms. In general, pkt will try to use the best algorithms available.