KiCAD PCBNEW script to generate teardrops
Run it from the python console (import teardrops). To undo, delete all drawings in the copper layers. To re-apply, type reload(teardrops).
This script has no idea about DRC, so it is not a very good tool for production boards.
If you feel that teardrops is an important feature for you, please vote for it here. Also see this patch by Mikhail Karpenko.