The Computing section on Wikibooks deals with books on Computer Languages as well as other related books.
LandofCode offers tutorial based courses in languages ranging from PHP to scripting languages like HTML. It even offers a Real-time code editor to let you see how your code works.
With courses in HTML 5, AJAX, jQuery and much more, WebMonkey is the right portal for you to learn quick.
W3Schools is a popular portal among the student community to learn languages in Web and Multimedia domain through easy tutorials.
Free-ed College of Computers & Information Technology provides courses in many languages such as Visual Basic, C++, ASP and even Perl.