Class Tools is a project founded by a French teacher, Russell Tarr, who is dedicated to the development of the classroom. Although the site is relatively old, it is still very useful for teachers. Currently, the site offers 20 free quizzes or diagrams, as well as educational games that you can use for free and put on your own website without logging in.

What's on the Class Tools website It is an open-access (Licensed under Creative Commons) resource recommended by many teachers, where you can also refer to or use games already created by others.