*[Object-Oriented Programming in the BETA Programming Language](http://www.daimi.au.dk/~beta/Books/) - Ole Lehrmann Madsen, Birger Møller-Pedersen, Kristen Nygaard
*[Object-Oriented Programming in the BETA Programming Language](https://beta.cs.au.dk/Books/) - Ole Lehrmann Madsen, Birger Møller-Pedersen, Kristen Nygaard
*[Mastering Xamarin UI Development, Second Edition](https://www.packtpub.com/free-ebooks/mastering-xamarin-ui-development-second-edition) - Steven F. Daniel (Packt account *required*)
*[Object Oriented Programming using C#](http://bookboon.com/en/object-oriented-programming-using-c-sharp-ebook) - Simon Kendal, Bookboon. (email address *requested*, not required)
*[Threading in C#](http://www.albahari.com/threading/)
*[Xamarin Cross-Platform Development Cookbook](https://www.packtpub.com/free-eBook/xamarin-cross-platform-development-cookbook) - George Taskos, Packt. (email address *requested*, not required)
*[Xamarin.Forms Succinctly, Syncfusion](https://www.syncfusion.com/ebooks/xamarin-forms-succinctly)(PDF, Kindle) (email address requested, not required)
*[30 Days of Elixir](https://github.com/seven1m/30-days-of-elixir) - Tim Morgan (HTML)
*[Elixir School](https://elixirschool.com)(HTML)
*[Elixir Succinctly, Syncfusion](https://www.syncfusion.com/ebooks/elixir-succinctly)(PDF, Kindle) (email address requested, not required)
*[Études for Elixir](http://chimera.labs.oreilly.com/books/1234000001642/index.html)(HTML)
*[Getting Started Guide](http://elixir-lang.org/getting-started/introduction.html)(HTML)[(PDF, MOBI, EPUB)](https://github.com/potatogopher/elixir-getting-started)
*[Joy of Elixir](https://joyofelixir.com) - Ryan Bigg (HTML) - [Source](https://github.com/radar/joyofelixir)(:construction:*in process*)
*[Learning Elixir](http://learningelixir.joekain.com) - Joseph Kain Blog (HTML)
*[Études for Erlang](http://chimera.labs.oreilly.com/books/1234000000726/index.html) - J. David Eisenberg
*[Getting Started with Erlang User's Guide](http://www.erlang.org/doc/getting_started/users_guide.html)(HTML)
*[Learn You Some Erlang For Great Good](http://learnyousomeerlang.com) - Frederic Trottier-Hebert
*[Making reliable distributed systems in the presence of software errors](http://www.erlang.org/download/armstrong_thesis_2003.pdf) - Joe Armstrong (PDF)
*[Force.com Platform Fundamentals: An Introduction to Custom Application Development in the Cloud](http://www.lulu.com/shop/salesforcecom/forcecom-platform-fundamentals/ebook/product-17381451.html)
*[Big Data Analytics with Hadoop 3](https://www.packtpub.com/free-ebooks/big-data-analytics-hadoop-3) - Sridhar Alla (Packt account *required*)
*[Cloudera Impala](http://www.cloudera.com/content/www/en-us/resources/aboutcloudera/cloudera-impala-ebook.html) - John Russel
*[Cloudera Impala](https://docs.cloudera.com/documentation/enterprise/latest/PDF/cloudera-impala.pdf) - John Russel (PDF)
*[Data-Intensive Text Processing with MapReduce](http://lintool.github.io/MapReduceAlgorithms/MapReduce-book-final.pdf)(Jimmy Lin and Chris Dyer) (PDF)