There seems to be some confusion over the Naming Convention chosen...so, as posted elsewhere, let's set the record straight; I originally called it "BS" as a bit of a joke.  I still like that name as it stands for *cough*BS*cough* err BootStrap. When it got quasi-official acceptance, that was changed to "CE" which stands for Community Edition.  
Under the umbrella of CE is (as of today) ONE release; PHOENIX [ https://github.com/gburton/Responsive-osCommerce/archive/master.zip ]
Bootstrap v4.  There are also two development Tags which were fixed points in the timeline to release of Phoenix; GOLD [ https://github.com/gburton/Responsive-osCommerce/archive/v2.3.4-GOLD.zip ]
Bootstrap v3.  FROZEN [ https://github.com/gburton/Responsive-osCommerce/archive/2341-Frozen.zip ]
Bootstrap v3, with more modularity.  Simple, isn't it  Well, I think so even if you don't.