JPerf is a perfect hash function generator for Java. The principle of perfect hashing is to reduce the average constant overhead of a hash table by precomputing a hash function which is optimal for the key set. Other advantages include a reduction in memory usage. Finding such a hash function is hard, especially in the general case. These run-time savings come at a cost of increased map creation time. JPerf can create a perfect hash function for a given set of keys and values.
The Spiffy Framework is a collection of well-tested and often used helper methods and utility classes. Such methods and classes solve existing and recurring practical problems, and remedy annoying features of the Java language or its frameworks. The value of this framework is not only the code, but also the ideas for solutions to the problems. The goals are to collect and centralize "utility abstractions", and to serve as a repository of knowledge/smart ideas for programmers to learn.
Amiba is a Gene Expression Programming (GEP) framework for Java. GEP is, like genetic algorithms, a branch of evolutionary computing. The framework separates the process of evolution from the process of interpretation of the chromosome, allowing the use of various schemes. For example, graphs may be used as terminals and graph operations as operators in the chromosome instead of the usual double precision numbers. It implements mutation, transposition, and recombination. Options and rates are easily configured through an XML file. A mechanism to load fitness cases in bulk is also provided.
Fracture is a Java library that simplifies multi-core development. It accomplishes this by allowing a developer to easily replace CPU-intensive loops with a static method call that divvies the work to the available cores/CPUs. Future releases will focus on providing mechanisms for more complex scenarios, as well as provide programmatic access to the underlying object structure.
P~ (pronounced "P tilde") is a Java-like scripting language and regular expression engine. P~ offers novel powers to match, extract, and transform documents. Regex novelties include an easy-to-read algebraic syntax and general capture and statement insertion side-effects. This is a great benefit to Java users, who no longer need to outsource difficult regex problems to Perl/Python scripts, since ptilde is offered as a Java library as well as a standalone scripting engine.