Okay, so this may not be high-tech, but TeachersPayTeachers is an EXCELLENT resource when it comes to finding class lessons–and to share them! Think of it as an exchange. Many lessons are paid (usually in the $1-5 range), though many are completely free. Additionally, this could be a potential source of income, if you decide to share and sell your class materials. See more here: https://www.teacherspayteachers.com/, and don’t forget to stop by my store here.