WIMS (Web Interactive Multipurpose Server) is a a collaborative, open source e-learning platform hosting online interactive exercises in many different fields such as mathematics, chemistry, physics, biology, French and English among others. The pedagogical specificities of WIMS will be shown, such as a bank of exercises readily available, the deeply embedded random feature, a wide variety of exercise types, including formal answers and personalized student monitoring tools. We will also present how to make custom exercises.