You can change the corner portion…

an open source PCB editor for Microsoft Windows, released under the GNU General Public License.

You can change the corner portion…

change the corner portion

…of the route formed by two adjacent segments, adding two more segments by pressing just one button. Sometimes useful when editing. When the first vertex is selected, move the mouse to where you want to place the new vertex,

modify the corner portion

and then click F6_Insert_Vertices. That’s what happened:

Copper traces

After that, the next nearby vertex will be automatically selected to speed up editing.

Freepcb2 copper traces