Concord Consortium maintains a collection of interactive educational tools that are free to access. They have subjects beyond science, though the majority of the tools available on their website are science/STEM tools. Resources can be found by grade level, subject, or a keyword search.
Collections are groups of related resources that can be used to explore a subject. These collections often include an introduction to the subject as well as interactive resources to explain deeper aspects of the subject.
Multi-page activities walk students through a subject with interactive demonstrations.
After an activity is complete they will include a summary showing aspects of the activity and their status