I have a few ebooks either published or in progress. See the below list to purchase or register your interest.
All About CAPTCHA’s – Looking for a practical guide to CAPTCHA decoding? . This eBook will teach you how to identify weaknesses and exploit CAPTCHA’s from beginning to end. Buy now using LeanPub | Buy now using Gumroad
Write a Search Engine From Scratch. Are you really interested in learning how to Write a Search Engine from Scratch? Click this link and register your interest for the book about how to do so.