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.

This User Guide is written by Eben Upton, Co-Creator of the Raspberry Pi

Mathematics for Computer Science (November 2013 Version) old link directed to a page that requested password, used a new link that doesn't require one.

Handbook of Graph Drawing and Visualization

Added a majority of the books found in issue #688. I excluded one book that looks like it had an illegal download link and also all books in other languages (mainly French).

Learn Python in Y minutes
The Python Ecosystem: An Introduction

Added a new book on Titan Graph Database

No longer published

Anchor link for Isabelle/HOL was not working when viewing the Github parsed file.

Added direct link to PDF and Kindle formats at syncfusion.com;
No login required.

Added Let's learn Go! - http://go-book.appspot.com

for these new languages: Alef, Chapel, Cilk, Limbo, and OpenMP.