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A java based digital logic simulator, designed to be used as an educational tool.
uses a GUI to allow users to quickly and easily create and visualise circuits from simple components. User can create custom components
jChart is a free Java library for drawing complex business & scientific charts. It may be used in Java applications and applets as a Swing-like GUI component, and also in servlets to publish the charts on the Web in several formats.
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.