I'm a bit late with this, but there are free mobile scanning apps like Notebloc or Microsoft Lens you can use to take a picture with your phone and remove distortion.
Gimp is a free and open-source alternative to Photoshop. It's not as good for drawing, but works well for altering images.
David's using his computer screen as a light table and tracing on to art board.
Options:
Take a picture with your cellphone and load it on your computer by emailing it to yourself. All computers come with a graphics program. You can then use computer screen as light table.
A copy machine and a backlit surface (window, lightbox, glass table with a lamp underneath) will do the trick. Copy and print at a larger size then trace on the backlit surface.
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