DanDMadeEasy
DanDMadeEasy provides a range of resources that can making D&D easier for students and which are free for use in school D&D clubs.
They have a set of rules reference cards and other printable products that are free to all and can help kids and adults understand the rules and make the most of their D&D sessions.
They also have a range of stylish, accessible print at home player aids that make it easier and more immersive to play D&D at the table, and they offer them all for free for use in school D&D clubs - learn more on their outreach page. You will need to contact them to arrange a license at no cost.
All of DanDMadeEasy's products are designed to be printed on a color printer and come with detailed assembly instructions YouTube videos (for some of their products). You can see some of their products in action on their YouTube channel.