Which mathematical software company first pioneered the 'freemium' model for educational institutions, offering basic calculation tools for free while charging for advanced features?

In the world of mathematics education and products, marketing strategies have evolved dramatically over the decades. From textbooks to software, companies have employed various techniques to gain market share in the competitive educational technology space. This question explores a groundbreaking marketing approach that transformed how mathematical tools are positioned in the marketplace.

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Wolfram Research (Mathematica)
Maplesoft (Maple)
GeoGebra
Texas Instruments (TI-Nspire)