Here you can get a Free ebook collection named “The Ultimate Raspberry Pi eBook Bundle” for FREE now. The bundle includes the following eBooks
Raspberry Pi Robotic Projects by Richard Grimmet
Create amazing robotic projects on a shoestring budget
Raspberry Pi Home automation with Arduino by Andrew K Dennis
Automate your home with a set of exciting projects for the Raspberry Pi
Raspberry Pi Cookbook for Python Programmers by Tim Cox
Over 50 easy-to-comprehend tailor-made recipes to get the most out of the Raspberry Pi and unleash its huge potential using Python
Raspberry Pi Computer Vision Programming by Ashwin Pajankar
Design and implement your own computer vision applications with the Raspberry Pi
The total value of the bundle is around 90$ but you can get it from this link for FREE. This offer will get expired by 20th December 2015.
You will need to create an account on the Tradepub if you do not have one (It is Free). When you request the book they will send the download link to the email address which you used to register the account. I just got my copy, get a copy for yourself.