These Apps can be used to create and edit images
This App is software that you can download and use as an alternative of Photoshop
Use these apps to create and edit audio files
GarageBand (for Mac)
These apps are ways you can create charts, diagrams, posters, and other singular visual aids to provide information
(You can create and show from online but you cannot download for free)
SketchUp- Make Draw in 3D!