There are so many wonderful free, or almost free websites to use for homeschool, after school, or just to supplement your kids over Summer. I won't share the ones I don't like, lol. None of these I have affiliation with, except Currclick.
First one is Easy Peasy Homeschool. This woman has dedicated so much time to making a free curriculum for anyone to use. It is amazing. My kids didn't care for it a ton, but if you have no money, or money is really tight, it is awesome. There is even high school now too.
Second is, Currclick. Currclick offers free and paid options for the items offered. Most are made by homeschoolers. They have live classes that are just amazing. Check out Currclick for sure.
Last, but not least, for this week, is Forensics Illustrated. This is a free, and complete Forensics class for High School. I will definitely have my son take this one during his high school years. Check it out!