Tcl/Java consists of two pieces of software. Jacl is an implementation of a Tcl interpreter written entirely in Java. Tcl Blend is a Tcl extension that provides access to Java from inside Tcl. One can prototype Java code using Tcl, and much more.
Relational Database Management System
A relational database management system, based on the principles laid down in the book "Databases, Types, and The Relational Model: The Third Manifesto" by C. J. Date and Hugh Darwen.
ACDK - Artefaktur Component Development Kit - is a platform independent C++-framework similar to Java or C#/.NET for generating distributed and scriptable components and applications.
An IRC client that uses Tcl for not only the scripting, but also the "glue" at the C level for how all the parts of the application fit together.
nsjava is a loadable c-module which embeds a java virtual machine in aolserver. This module is being developed to support the openacs project - see http://openacs.org, but it could find general application as a web development tool.