Ninja Remote Debugger, HTML5 CSS3 WebSockets GUI, MultiProcess MultiThreaded Asynchronous Tornado Backend, Python 2.x / 3.x / PyPy Support, Built In Set_Traces Snippets to insert on code or copy to clipboard, Keyboard Shortcuts map, Light / Dark Theme Skins, Customizable Debugger Process CPU Priority, step by step debugging, in-program python code execution, code edition, setting breakpoints, code autocompletion, Step into, Step over, Step out, Continue, Until Next, Eval current line, Multi-lines operations, Debug Object under Cursor, inspect code on exception, Debug different Python Version, Integration with Django / Flask / CherryPy / Tornado / Wsgi debug, and more. No GUI it adds a Group of Menu entries. Requisite: sudo pip install wdb