* [Bitcoin and Cryptocurrency Technologies](https://d28rh4a8wq0iu5.cloudfront.net/bitcointech/readings/princeton_bitcoin_book.pdf) - Arvind Narayanan, Joseph Bonneau, Edward Felten, Andrew Miller, Steven Goldfeder (PDF)
* [Blockchain By Example](https://www.packtpub.com/free-ebooks/blockchain-example) - Bellaj Badr, Richard Horrocks, Xun (Brian) Wu (Packt account *required*)
* [Category Theory for the Sciences](https://mitpress.ublish.com/ereader/77/?preview#page/Cover) - David I. Spivak
* [Come, Let's Play: Scenario-Based Programming Using Live Sequence Charts](http://www.wisdom.weizmann.ac.il/~playbook/)
* [Communicating Sequential Processes](http://www.usingcsp.com/cspbook.pdf) - Tony Hoare (PDF)
* [Computer Musings](http://scpd.stanford.edu/knuth/index.jsp) (lectures by Donald Knuth)
@ -584,6 +588,7 @@
* [Programming with Unicode](http://unicodebook.readthedocs.org)
* [Real-World Maintainable Software](http://www.oreilly.com/programming/free/real-world-maintainable-software.csp) (email address *requested*, not required)
* [Record-Playback Test Automation: Sahi & Selenium IDE: Critical Evaluation of Record-Playback Automation Tools](https://leanpub.com/manualToAutomatedWithSeleniumIDEAndSahi) - Shashikant Jagtap *(Leanpub account or valid email requested)*
* [Scientific Programming and Computer Architecture](https://divakarvi.github.io/bk-spca/spca.html) - Divakar Viswanath
* [Control and Embedded Systems](http://www.learn-c.com) (HTML)
* [Discovering the STM32 Microcontroller](http://www.cs.indiana.edu/~geobrown/book.pdf) (PDF)
* [Introduction to Embedded Systems, Second Edition](https://ptolemy.berkeley.edu/books/leeseshia/releases/LeeSeshia_DigitalV2_2.pdf) - Edward Ashford Lee, Sanjit Arunkumar Seshia (PDF)
* [Introduction to Microcontrollers](http://www.embeddedrelated.com/showarticle/453.php) (HTML)