Virtual Science Courseware Project

From site:  The Virtual Courseware Project offers interactive, online simulations for inquiry-based science, the life science laboratory, geology labs, and biology labs. The biology labs are designed for advanced high school and college students. The other interactive virtual labs can be used by students ranging from middle school, high school, or college classrooms. These activities are designed to enhance an existing curriculum and include online assessments. Free registration is required to access the courseware.