Piktochart is an online graphic design tool that can be used to create multimedia designs such as posters and infographics.
Creating an account is free and comes with the use of many templates, elements, fonts, and images. You can create and download as many designs as you want, but some elements/images are only for a paid plan. Downloading high quality images is also part of an upgraded plan.
Example of an assignment using Piktochart:
Your school wants to inform parents on what the students are going to do on their trip to Paris. Instead of a regular email, management has decided to create a poster with all information on it. Design the informative poster using Piktochart.