NecJGui is an antennas design tool, interface for Numerical Electromagnetic Code. It allows easily making NEC input files, and viewing them in 3D. It also contains a version of the simulator, so it's complete IDE for full-wave EM simulation.
The aXBench (AUTOSAR extensible workbench) is a free eclipse plugin for modeling variant system architectures.
This project collects modeling examples for the aXBench without having ti deal with the source code of the aXBench.
Framework for modelling of Natural General Intelligence. This project aims at creation of open source AGI (Artificial General Intelligence) through modelling of natural thinking. See http://roland.pri.ee/bakalaureusetoo/ for theoretical details.