Description: GeoGebra is free and open-source dynamic mathematics software for all levels of education. It combines geometry, algebra, spreadsheets, graphing, statistics and calculus in one easy-to-use package. It can be used to teach math from elementary through university level.
Type: software
Pricing: Open Source
Description: Project Gutenberg is an online library containing over 60,000 free eBooks. The eBooks are available in epub, Kindle, HTML and simple text formats. The library focuses on public domain content.
Type: software