Free Online Programming Books

I have been surfing for a while and been looking for free online programming books.
These books are scattered all over and not easy to find. So i’m blogging on this so i can have a central location of all the online programming books i come across on the web. Hope it helps some one some day. Additions to the list are welcome. Just let me know and i will include them. Most of these links where taken from Programming ebooks

Java

C#

C++

C

Ruby

Perl

Python

Php