Code Transfer

lesscss->css

http://leafo.net/lessphp/editor.html

language learning(perl ruby python PHP Html css Java)

http://www.tutorialspoint.com/index.htm

Language compiler online

http://www.compileonline.com/

Jalint Javascript code tidy

http://www.jslint.com/

perl code check and lint

http://perlcritic.com/

http://www.w3school.com.cn/

http://validator.w3.org/

http://www.w3schools.com/

http://jigsaw.w3.org/css-validator/#validate_by_uri