Physlet
Physlets are physics applets that are free for non-commercial use and were created by the same team as the Open Source Physics Project. Since their creation at Davidson College in 1998, over 2,000 individual exercises have been created using Physlets for the teaching and learning of astronomy and physics on a variety of levels and a variety of settings. Physlets have also been used in a number of textbooks, and have been translated into a number of languages including: Spanish, Slovenian, German, Hebrew, and Portuguese.
The original Physlet-based interactive materials relied on Java applets. With the 2014 release of the new HTML5 standards, browsers gradually ceased supporting plug-ins, such as Java. In 2018-2019, Physlet Java Applets were ported to JavaScript/HTML5 in collaboration with Robert Hanson (St. Olaf College) using the java2script-SwingJS platform, which allows Physlet-based materials to run on any platform (desktop, laptop, tablet, phone) using any recent JavaScript-enabled browser.