http://www.squarefree.com/htmledit/ test your html online
http://www.codase.com/
http://www.koders.com/
http://www.php-csl.com/ open source application that let you keep php code snippets for future reference. doesnt need database
http://www.squarefree.com/shell/shell.html
http://paularmstrongdesigns.com/examples/css/awesome-form.html create pure css form without coding any