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Approved Open-Source Textbooks
This is a list of open-source textbooks approved by the American Institute of Mathematics.
"GeoGebra is free and multi-platform dynamic mathematics software for all levels of education that joins geometry, algebra, tables, graphing, statistics and calculus in one easy-to-use package. It has received several educational software awards in Europe and the USA."
Open textbook written by Profs. Thomas Tradler and Holly Carley at City Tech.