For developers and web designers can be very difficult to memorize the syntax for various programming languages, especially considering that they are always constant evolution and growth, so it is normal that you forget things. Cheat sheets are reference guides with useful information, features and functions of a particular language. In this article you’ll find 60 most useful cheat sheets about HTML5, XHTML, CSS, JavaScript / Programming Languages, Databases, Subversion, Mod_rewrite, MySQL and some other useful cheat sheets.