Half Knife is a product for PRO users who wants to improve their work speed.
The tool is designed by PRO Blender user. And now he can work faster with this tool. Here is his artstation:
https://www.artstation.com/michaelweisheim
Demo
Here is demo video with features overview. Also here you can see how PRO user is modeling awesome robot with my tool.
The updated version with more features:
Blender Artists discussion:
https://blenderartists.org/t/half-knife-fast-knife-tool-for-blender/