Style guide for development.

Java
http://google-styleguide.googlecode.com/svn/trunk/javaguide.html

C++
http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml

R
http://google-styleguide.googlecode.com/svn/trunk/Rguide.xml

javascript
http://google-styleguide.googlecode.com/svn/trunk/javascriptguide.xml

JSON
http://google-styleguide.googlecode.com/svn/trunk/jsoncstyleguide.xml

Objective-C
http://google-styleguide.googlecode.com/svn/trunk/objcguide.xml