This open educational resource project, out of the University of California Davis, offers a variety of lab experiments, visualizations/simulations, demonstrations/techniques, case studies, interactive applications, and worksheets for archaeology, biology, chemistry, geosciences, math, medicine, physics, and statistics. From the LibreTexts home page, use the “Explore the Libraries” tab to find additional course materials.
A crowd-sourced Google Doc of virtual simulations for science courses and labs. Type of Resources include Simulation/Virtual Lab, Data Sets/Sources, and Case Studies. All content is free or openly licensed.
The Simulation and Virtual Labs page from the Colorado School of Mines' guide is rich in resources and covers a variety of subject areas such as Astronomy, Biology, Engineering, Math, Physics and more.