NandExtract is a utility for extracting files from a nand.bin, as well as for examining its content. This tool can be built on Windows, Linux, or Mac OS X using Qt. It enables users to view all the blocks of the NAND dump, as well as to get information about the boot sector.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.