Uncrustify - Banish crusty code with the Uncrustify C/C++/C#/Obj-C/D/Java/Pawn/VALA source code beautifier.
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.