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Gemello is a relational database written in pure Java. Its design is aimed at teaching. If you're searching for a fast relational engine, Gemello won't be a good choice. Is's rather a good and simple example of relational database implementation.
Pödznsatch is a open and distributed hypergoogle of love. It is a semantic web application for social networking, word-of-mouth analysis and profiling. The Pödznsatch architecture includes a bot crawler, an inference engine and a query interface.
XSWT is an XML-based GUI-description language for SWT. The XSWT engine uses Java reflection to actually construct a user interface, so it is automatically compatible with current and future SWT controls. An Eclipse editor for XSWT files is included.
bexee (BPEL Execution Engine) is an open source Java engine that allows deploying and executing business processes described in the Business Process Execution Language (BPEL).
DOEDELS is a (multi- and) singleplayer adventure enigine written in java(j2se1.5 +). The project contains the games-engine and some editors to create your own 2d adventures. The Adventure will allow to mix the gameplay with some details of RPG- and strat
Joctree is a real-time graphics engine for Java. The engine supports scene-optimization via octrees, and will support basic model and animation formats (Wavefront/Obj and Quake/MD2).
Algernon is a rule-based reasoning engine written in Java. It allows forward and backward chaining across Protege knowledge bases. In addition to traversing the KB, rules can call Java functions and LISP functions (from an embedded LISP interpreter)
This Projects purpose is to provide a simple Engine to play a basic 2 player Strategy Boardgame.
This engine allows you to write computer agents to experiment with AI techniques (minimax, alpha-beta Pruning, neural networks ...)
TM4J is a topic map engine implemented entirely in Java. Topic maps are a standard paradigm for the interchange of knowledge structures. This project aims to produce a complete suite of tools for creating, processing and publishing topic map information.
YAWTE (Yet Another Web Template Engine) is an alternative for generating dynamic content using Servlets. It contains a few template tags used to specify template structure and a tiny Java API for loading templates and generating content.
FTPSearch/Agent is a fully functional ftp indexing & searching engine for medium local networks (20-200 servers). Unique associative extend of searching allows you to garther much relevant results. FTPSearch/Agent is written in java and PHP and use MySQL
JFrog is a free distributed components-oriented framework created to develop multiplatform game engines with high source code reusability. Its possible to create game engines for personal computers and handhelds. Before this project was Amphibian.
BSFPerl is a Bean Scripting Framework (BSF) engine implementation that can be used to run Perl scripts from within Java, with no native code required. Java objects can be referenced transparently from Perl, and arbitrary Perl expressions are supported.
Oxyus is an open source search engine written in 100% Java, aimed to provide a search button to your website in an easy way.
Oxyus uses Apache Lucene for indexing, Quartz for scheduling and other interesting software products.
The main purpose is to provide a jukebox (Java/Swing -- mp3, ogg) for parties like a classic jukebox.
It also provides a powerful engine to scan, search music files a. to modify the tags of the files. Also a basic playback a. play lists are provided.
Deskblox is a scripting engine that integrates simple graphical widgets seamlessly onto the desktop. Widgets can be authored using JavaScript or Python.
Molimo project is a open, customizable database (just like the one from well known search engine company, but not only free but open). So far a generic DB mapper has been developed as back end that can handle runtime changes of attributes and types.
Chameleon is a general use persistence engine capable of object-relational mapping as well as other, non-object persistence needs. Its flexibility allows it to fit the needs of a an enterprise without the contstraints that O/R mappers generally impose
JavaMatch is an engine that can search inside a runtime Java data structures, and look for objects that best match the criteria that you specify. The extensive query mechanism allows for highly customizable tuning of your match queries.