I posted about a question about whether Coursera is still a good option for online courses, in the wake of their having downgraded their platform; but haven't gotten any replies: Teaching quality of Coursera math courses after platform re-design? So here is a larger question that might succeed better: Could we maybe create a stickie with recommendations either for particular online courses of high quality, and/or universities or independent platforms that sponsor high-quaulity courses? I'm interested in math but recommendations for physics, chem, and EE courses would also be welcomed. Stanford still has some independently run courses, apparently, e.g. there is Lagunita, which offers what looks like about 50 online courses at present, all running on the Open edX platform; putting aside humanities courses, the science courses look to be in medical/biological, computer science, logic & language, and statistics. Duke has Duke Extend which looks pretty sparse at the moment, with only a handful of courses, including one in astronomy and one on Linux. I haven't gotten farther than that but will probably be doing some more exploring in the future. At any rate I think listings of quality online courses, instructors, and programs/schools might be a useful resource if there is enough knowledge that such a stickie thread could be created. It would get dated; but hopefully the recommendations would be general enough to help people look in the right places.