Here is a website, Opensourceproject.org.cn, that offers 222 freely available online books and tutorial articles covering open source technologies. Most of these are written in English, some are in Chinese. The numbers below refer to the number of English books. These will help you learn how to program in open source languages and frameworks, such as Eclipse, Perl, Ruby, PHP, and Python. These will also help you gain knowledge and increase your skills with Ubuntu Linux, Red Hat Linux, Fedora, Suse Linux, the Linux Kernel, and Embedded Linux.