SyphonInject is an OS X utility that enables users to syphonize an application while it is running. It uses Scripting Additions, mach_inject, mach_override, and JRSwizzle to insert a Syphon server into a running process. This tool is only compatible with applications that render using OpenGL.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.