Canva is great for designing assignments and projects. I have also heard fantastic things about its Magic Design and Studios!
Twinkl has plenty of tools for teachers, from lesson plans to PowerPoint.
ELA:
Epic! can be used to provide Non-Fiction and Fiction books in the classroom, working with libraries to support literacy.
Math:
Prodigy is a fun and engaging way to allow math learning besides the typical worksheets and activities!
Science:
The Wonders of Science offers a wide variety of informative lessons and graphics that take the subject to the next generation of learning!
Social Studies + Arts Education:
Both subjects have interactive sites/tours provided by Google Earth, the National Gallery of Art, and any other virtual museum that guides the critical and creative knowledge to be seen from the classroom.
