i-Ready provides lessons at your student's level based on an assessment they took through the program (most recently in January/February). This is a great activity for learning, but also an alternative activity if there is difficulty accessing the general education resources. They use this weekly in the classroom for reading and math so they are well-versed in how to use it.
Prodigy is a resource students who use it seem to enjoy. I have not personally worked with it, but if your student needs help accessing it I'd be happy to connect with their general education teachers or our tech teacher about it and get back to you.
Khan Academy has videos on just about any math topic/skill so if you're working with your student and you or they need a quick refresher on a math skill these are helpful videos.
PebbleGo is a great research tool, especially used with our younger students but can be helpful for older students as well.
Accelerated Reader (AR) is a site where students can find books at their level and take quizzes on them to show understanding. Typically students are not allowed to take the quizzes at home during the school year but they have opened it up for this closure, just as they did last summer for the reading program.
Typing Club helps students work on their keyboarding skills.