Easy Java Simulations (EJS) is an interactive tool developed for the conceptual learning of science. Ejs is not designed for professional programmers, but for teachers and students who want to create (or modify)scientific simulations. With Ejs, they can concentrate on writing and refining the relations in the underlying scientific model,and dedicate the minimum possible amount of time to the programming techniques.
Ejs, is an authoring tool that automatically creates html files (web pages) with the applet embedded; students are introduced to these html files so that they can modify the default one created by Ejs to personalize it.