Interesting Links


Bicycling, Carfree & Simple Living


  • 1DollarScan – book scanning service ($1/100 pages with a maximum cost of $6 per book). Creates PDFs with searchable text.
  • E-Books Directory – the site had 6603 free e-books in 593 categories as of May 8, 2012.
  • LibriVox – free recordings of public domain books.
  • Project Gutenberg – free, plain text files of books with expired copyrights.
  • Self Publishing Guide
  • Wikimedia Foundation – encourages the development of open content and provides it to the general public for free without advertising. Projects include textbooks, an encyclopedia and a dictionary.

Consumer Information


  • CK-12 Foundation – California-based foundation offering free, open-content textbooks.
  • Common Core State Standards Initiative
  • Connexions – “a place to view and share educational material made of small knowledge chunks called modules that can be organized as courses, books, reports, etc.”
  • FreeMat (Linux/Mac/Windows)- “a free environment for rapid engineering and scientific prototyping and data processing. It is similar to commercial systems such as MATLAB from Mathworks, and IDL from Research Systems, but is Open Source.”
  • High School Operations Research – “Mathematics for Decision Making in Industry and Government.”
  • Khan Academy (article)
  • Mathbuntu – easy access to open source mathematics software and no-cost textbooks.
  • MIT OpenCourseWare
  • OpenStax – free, open-source, peer-reviewed books. This is an initiative of Rice University.
  • Sage: Open Source Mathematics Software (Linux/Mac/Windows) – “Mission: Creating a viable free open source alternative to Magma, Maple, Mathematica and Matlab.”
  • Singapore Math
  • Hung-Hsi Wu – UC Berkeley math professor’s papers on elementary and secondary school math education.

Games & Recreation

Investing & Personal Finance

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