EOS releases are named after gemstones. The actively developed version is called CITRINE.
Release Stable Version Description Release Notes Amber 0.2.47 1st EOS Generation Beryl 0.3.267 2nd EOS Generation Beryl Release Notes Citrine 4.8.99 3rd EOS Generation Citrine Release Notes Citrine 5.1.13 4th EOS Generation Diopside Release Notes