The final version of the Cluster Design Tools, ver. 0.8.5, was released in June 2015 and was made available for download. The changes are mostly about letting the software suite run with newer Python versions — 3.4.2 and higher.
This version is “final” in the sense that I no longer plan to work on this software. But since it is available under the GNU GPL license, you can take it and use it, and suit for your needs, should you wish to.