Xspray is a front-end application for lldb on OS X for Mac and iOS devices. It allows users to view the list of compile units, load C/ObjC/C++ source code with syntax coloring, and add or remove breakpoints from the source code by clicking in the gutter.
Blinged JSON Validator is a free app to validate JSON files with syntax highlighting, whitespace indentation, error messaging, and hotkeys.
