TyranoScript

The Japanese scripting/IF/Dating Sim game engine that powered "Jurassic Heart" is now available in English. It is a high level scripting language similar to Ren'Py with the advantage that it produces HTML5/JS games, so you can release your work on browsers and smartphones with no extra effort. Although the scripting language supports many common tasks, it is a real game engine with support for arbitrary HTML and JavaScript as well.