This website helps a student improve their Spanish Vocabulary. It takes the place of the old school written flashcard. I use this tool with my students. After I gained "teacher privileges" I was able to create lessons that pertained to my Spanish classes. I was also able to create accounts for all of my students. Now I can track the progress of my students and see how often they actually "study" their vocabulary.
Currently, WordPlay is only available for the Spanish language but I do know that they are working to expand the program to work with other language and even other subjects.