ClangFormat - A tool to format C/C++/Java/JavaScript/Objective-C/Protobuf code.
JSONFormatter.org - Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON
Artistic Style - astyle, code formatting
LESS Compiler - LESS Compiler makes formatted CSS styles from less source.
Code Beautifier - Code Beautifier CSS Formatter and Optimiser - Online CSS parser and Optimiser
SASS Compiler - Generate CSS code from sass source using SASS Compiler. Beautify CSS if necessary.