MKS Plugin for Real Studio allows you to construct programs which can handle numbers with units much like doubles and integers are handled. The basic MKS units are Meters, Kilograms, Seconds, Coulombs, Kelvin, Dollars, Angular units, Solid angle units, and Luminosity.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
