Wise, based out of UC Berkley, provides web-based, inquiry science projects for grades 6-12. Each project is an exploration into a topic that is meant to be done over several days. There are informational slides, questions to answer and thoughts and ideas to be generated and assessed. It’s not very flashy, but the projects are very well-structured and require a lot of thought and interaction. I love that they ask a lot of questions that don’t have a right or wrong answer. The projects are meant to be done in teams, but could be adapted for single students. Sign up for a free account.