What is "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 Portueguese.