CodePad is the quickest and easiest way to edit source code files on your Mac. With support for xml, json, c++, c-sharp, java, php and many more, this app is a tiny profiled one stop stop.
Please note: a bug with themes has been found in the 1.0.0 release. The price has been dropped to $0.99 to make up for this issue and an update fixing the problem has been submitted to the app store.