This site is home to a very easy to use animation package called Monkeyjam - there are plenty of good tutorials on how it works in YouTube.
The software lets you capture frames using a webcam or scanner - or you can simply import individual photos, sound and even special effects using a package like Photoshop.
Lego seems to be a popular medium - but you can use whatever comes to mind.
Sparknotes.com packages up study guides across a broad range of subjects, including computer science, economics, literature, maths and philosophy.
The clear and succinct guides are written by students and recent graduates who specialise in their fields. Bear in mind the content is based on the North American education system.
The site made its name originally with literature study aides, so this section is especially thorough.
You can also test yourself for free, but the actual grading is offered as a premium service.
Mario Paint Composer found in unfungames.com allows you to create your own musical masterpiece.
Sounds are represented by popular Mario characters which are placed on a score sheet to compose music. There is a good tutorial on YouTube for the finer details.
You will not be able to export the tune, but if you use a screen recorder such as Screencast, you can package your composition up to share with others.
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