Power Spline by C4Dzone.com developer: Caleidos4D
Power Spline is a Cinema 4D plugin developed to help user to create Spline with different shapes and multi handle feature. Power Spline is very easy to use: with its object based functionality you can choose from 11 different shapes as Rectangle, Ogive, Low Arc and much more.
INFO: https://www.c4dzone.com/en/shop/plug-ins-17/power-spline-290.htm