Necessitas is an Eclipse plug-in that adds a class-path container to manage a projects jars using the ivy dependency manager. It gives you all of the advantages of ivy without leaving Eclipse. It will download the jars your project depends on and add them to your projects classpath. You can optionally have it automatically update your classpath whenever a change is made to the ivy module.
Drools is a Rete-based rules engine written in Java, but able to run on Java and .Net. it is designed to allow pluggeable language implementations. Currently, rules can be written in Java, Python, and Groovy. It also enables domain-specific languages (DSLs) via XML using a schema defined for your problem domain. DSLs consist of XML elements and attributes that represent the problem domain. An XML authoring tool provides a semi-rapid development environment with a drag and drop type interface based on the provided schema.
Webcockpit is a Web application generator for reporting and monitoring applications. It generates complete JSP-based Web applications which contain charts and tables whose contents are retrieved using database queries. The charts and tables can be configured to link to each other, enabling master detail-like drill-down. You can provide your own HTML or JSP template files which are mixed with the generated JSP to provide a final Web application.
Native XmlDB Query Daemon is a client-server version of the Sleepycat native XML database deployed as an Apache module. The client is a pure Java API, supporting XQuery, XPath, and an Xml:DB API layer. It comes with a graphical admin console. Server binaries are provided for Linux x86 and x86-AMD64; for other platforms, compile from source.
Chessweb is a J2EE chess game Website. It is a pure Java servlet implementation of a two-player chess game. Two players log into the Web site, see an image of the current board in their browser, and make their moves. The differentiating features of chessweb (e.g. versus WinBoard / XBoard) is that it's an extremely lightweight implementation written completely in Java (nothing more than an app server and browser is required). Furthermore, the client end is DHTML only, and verified to works with FireFox 1.0.6 and IE 6.