I love  Quizlet and use it often for a review in my eLearning courses before someone takes a final exam. Quizlet just released a new feature called Diagrams. You upload an image and then identify different points on the image to identify a key term and definition on your image. 

I can already see how restaurants could use this in their eLearning courses. Upload an image of a new dish, identify the different ingredients in the dish and allow the student to try to match up the ingredients with the image. 

Quizlet’s YouTube video shows you how Diagrams work so if you’re thinking Diagrams might be useful to you as well, check it out.