ES5 (ECMAScript 5) was released with lots of new features.
It changed to annual realease cycle,
(With small feature Updates.)
Releases of versions - ES2016/ ES2017/ ES2018/....
Google Apps Script, a cloud-based/server-side interpreter that provides programmatic "macro-like" control of Google Apps services and documents.
Chakra, a fork of JScript, is developed by Microsoft and used in their Edge browser.