Kcachegrind is a debugging tool used to generate call-graphs and cache simulations through the Valgrind framework. It can profile shared libraries, dynamically opened plugins, and generate performance results in data files. KCachegrind can also be used with conversion scripts to visualize output from other profilers like OProfile.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
