ClangFormat - A tool to format C/C++/Java/JavaScript/Objective-C/Protobuf code.
JSONLint - JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
Artistic Style - astyle, code formatting
JSON Editor Online - View, edit and format JSON online
Code Beautifier - Code Beautifier CSS Formatter and Optimiser - Online CSS parser and Optimiser
JSON Formatter & Validator - The JSON Formatter was created to help with debugging.