The website could be made clearer on that part. I was reading these pages which imply 2014 being last release
http://www.axiom-developer.org/axiom-website/releasenotes.ht...
http://www.axiom-developer.org/axiom-website/currentstate.ht...
On the other hand, the download page has 2017 version available as the latest
http://www.axiom-developer.org/axiom-website/download.html
If the project is alive and active, please let show so people would be more inclined to try it out.