Line-Line Intersect
The Line-Line Intersect plug-in creates points based on where selected lines intersect and where they would leave the stock boundary. Selecting at least two lines and then running this plug-in creates two new workgroups. The workgroup named Intersection Points contains the point(s) where the lines intersect each other; the workgroup named Intersection End Points contains the points where the lines would leave the stock boundary when fully extended.