Antimony is new open source CAD developed by Matt Keeter. Design in Antimony is done by connecting nodes in a graph, each node is defined by a customizable script and nodes usually represent a primitive shape or transform.
It is still under development and it is not meant as a professional CAD software for higher level applications. It will be interesting to see how it will develop in the future.
If you are enjoying OpenSCAD or any other programmatic CAD (and probably have a slight masochistic note) you will want to try this as an alternative.
It is described as:
Antimony is a computer-aided design (CAD) tool from a parallel universe in which CAD software evolved from Lisp machines rather than drafting tables
... but you will understand it better when you watch the video:
It currently runs on Linux and Mac but you can get it on Windows with help of a virtual machine.
Antimony homepage:
http://www.mattkeeter.com/projects/antimony/3/Antimony GitHub repository:
https://github.com/mkeeter/antimony