django-debug-toolbar
The Django Debug Toolbar is a configurable set of panels that display various debug information about the current request/response and when clicked, display more details about the panel's content.
Project Source: https://github.com/django-debug-toolbar/django-debug-toolbar
Project Documentation: http://django-debug-toolbar.readthedocs.org/en/1.2/

chisel
Chisel is a collection of LLDB commands to assist in the debugging of iOS apps.
Project Source: https://github.com/facebook/chisel

SublimeWebInspector
Web Inspector allow you debug Javascript right in the editor.
Project Source: https://github.com/sokolovstas/SublimeWebInspector
Project Homepage: http://sokolovstas.github.io/SublimeWebInspector/