Is it forbidden to earn money for translating and compiling computer programming books that are freely available in English, then preparing and publishing them under the name "Prepared by Engineer Bahaa"?

What you are doing by preparing the book with your effort, expertise, and translation of free sources is a useful and valuable work. There is no sin upon you in benefiting from the book's earnings. However, if you translate paragraphs verbatim without modification, you must attribute them to their author for academic integrity.