Adobe Illustrator and Photoshop
One product design module required us to use Adobe Illustrator to draw orthographic and isometric sketches of products, and render them using Photoshop.
This is a drawing and rendering of a computer Mouse I designed.
One project required us to take a take a well known designer (I was assigned, Philips Fidelio range) and design a Plug Adapter in a way that it looks like they designed it.
After many sketches and different ideas, I decided to go with a ring shape, which sits on a circular holder and can swivel 360 degrees.
I did the linework in Illustrator and the rendering in Photoshop.