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Flow diagram drawing. Makes it look hand-drawn.

Machine learning based system to mangle and play with the spelling of words.

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Trade, GDP, population, exports, etc... between different countries

Design wireframe of web-pages or apps online

FFT animations

Edit code/document with real-time collaboration.

Mathics is a free, general-purpose online computer algebra system featuring Mathematica-compatible syntax and functions. It is backed by highly extensible Python code, relying on SymPy for most mathematical tasks and, optionally, Sage for more advanced stuff.

Converts youtube videos