Canva is an online graphic design tool that can be used to create multimedia designs such as posters and infographics.
Creating an account is free. You can set up a team of designers if you want to work on several designs together. You can create and download as many designs as you want, but some elements/images are only for a paid plan.
Example of an assignment using Canva:
Create an infographic in Canva about a debateable topic that appeals to you. Try to make your infographic as convincing as possible!