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JApprDB is a database engine able to store knowledge by means of semantic networks, representing semantic relations between the concepts. Databases are supposed to be queried by Lojban - a syntactically unambiguous language based on predicate logic.
MushroomDB is a pure Java multiplatform Relational Database Management System.
There are two main goals: to make a fully SQL-92 compliant engine and to provide extensibility mechanisms. A JDBC Driver and a GUI client is supplied with the engine.
zTable is a mini-DBMS written in Java. It has 2 parts: a back-end DBMS engine and a front-end Eclipse editor plugin. The engine can be embeded in any Java application. The Eclipse editor can be useful as a free DBMS for end-users.
XQuench is an XML Query parser and engine. The aim is to provide programmers with an API that implements the specifications at http://www.w3.org/XML/Query At first, XQuench will be Java-only. Future versions will include C++, while keeping a similar API.
A lightweight versatile XQuery engine in Java, that is standards compliant and can efficiently evaluate XQueries on various containers of data -- even normal Java objects.
Not a search engine but navigation routes within a research domain.
The Centre d'Informations (CI) aim is to articulate and display whatever type of knowledge available on a given field (see screenshots examples for various fields).
The software is built as a network of information articulated using concepts (figure). The website should not be understood as a conventional search engine but as different ways to navigate within this knowledge (information and concept) network.
Each information is thoroughly formalized; the aim is not exhaustivity or...