Added "Agile Android Software Development" eBook in the list under the Android section. The book is currently in writing progress, but new chapters are released as soon they are copy-edited. "Release 1.0" is expected in January 2015.
* [Alef Language Reference Manual](http://doc.cat-v.org/plan_9/2nd_edition/papers/alef/ref)
* [Alef Language Reference Manual](http://doc.cat-v.org/plan_9/2nd_edition/papers/alef/ref)
### Android
### Android
* [Agile Android Software Development](http://www.agiledroid.com) (PDF, epub, mobi - need email confirmation) by Etienne Savard
* [Android 4 App Development Essentials](http://www.techotopia.com/index.php/Android_4_App_Development_Essentials)
* [Android 4 App Development Essentials](http://www.techotopia.com/index.php/Android_4_App_Development_Essentials)
* [Android Programming Guide for Beginners](http://eduonix.com/offers/Android_ebook_free_offer.html) (PDF - need email confirmation)
* [Android Programming Guide for Beginners](http://eduonix.com/offers/Android_ebook_free_offer.html) (PDF - need email confirmation)
* [Android Programming Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/android) ([PDF](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.pdf), [Kindle](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.mobi)) *(Just fill the fields with any values)*
* [Android Programming Succinctly, Syncfusion](https://www.syncfusion.com/resources/techportal/ebooks/android) ([PDF](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.pdf), [Kindle](https://www.syncfusion.com/content/downloads/ebook/Android_Programming_Succinctly.mobi)) *(Just fill the fields with any values)*