Open source
Today’s products are Sigil and Praxis. This is what we published over the years, mostly for teaching.
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jDrawingLib
A Java library for drawing on a canvas and learning object orientation: geometry, animation, and graphics.
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MRFT
An MLP trainer over real functions, to show the training process and topology choices. Includes a synthetic ECG example.
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exp4j (fork)
A Java mathematical-expression evaluator, based on Frank Asseg’s work, with extra functions and performance work.
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And more
A circuit simulator, a function plotter, concurrency examples, and utilities for jDrawingLib. GPLv3 or MIT, depending on the repository.