Cut Corner (blender addon)
Cut Corner is a small tool for cutting corners of selected faces.
It is useful for creating Sci-Fi model, Spaceship parts, Hard Surface blocks, etc.
- You can adjust the size of corners 
- The cut is done directly on the selected face. All geometries are connected 
- Auto merge for duplicated corner vertices 
- After cutting, you can select and extrude it 
The tool is best used with Face Cutter (my another addon) for creating complex sci-fi mesh. Or you can just use sub-divide / Knife tool to help with modeling.
Usage
Go to Blender edit mode, face selection mode , select faces.
Then, right click on the viewport , select "Cut Corner" from the bottom of popup context menu.
This is a free addon : )
If you want to support me, you may consider buying my other addons.
Hope you like it !