Smart angle drawing 
Holding down "Shift" key, you can draw a pretty angle multiple 45 degrees between current and previous segments of your line or polygon geometry.
The tool also help to draw a pretty angle between first and last segments.
Awesome editing 
This tool help to edit angles to right from existing lines and polygons.
Brainy spin 
Designed to rotate the lines and polygons.
Capturing over the vertex, you can rotate a geometry with respect to its center.
Capturing of the segment, the figure turns relative to its center.
The tool allows you to deploy a line or polygon parallel to the segment of other figure with respect to the selected segment.
Multi-editing 
Holding down "Ctrl" key, select all needful features.
By moving accessory rectangle, move all selected geometries.
Holding down the left mouse button outside accessory rectangle you can turn selected geometries relative to its center.