JavaScript dialect engines

JScript is Microsoft's legacy dialect of the ECMAScript standard that is used in Microsoft's Internet Explorer web browser and HTML Applications, and as a standalone Windows scripting language. It is proprietary software.

programming language developed by Microsoft

QtScript is a scripting engine that has been part of the Qt cross-platform application framework since version 4.3.0. It was first deprecated as of Qt 5.5, then dropped as of Qt 6.5, and replaced by Qt Meta-object Language (QML).