There's a program called GIMP that I occasionally use. It's free! Download here: .gimp.org/
There are many places where one can download good drawing programs. Some good drawing programs that can be downloaded are Smart Draw and Sketch Master.
There are many cheap but respected drawing programs that are available for a persons use. These include programs called Gimp, Paint, and a program called Sketchbook.
There are a few programs to make a computer drawing. Some would not agree though on which is the best. So a suggestion would be to try the two following and pick which one feels is the best for them. One is GIMP (free and excellent). The other one is Photoshop (costs some).
They should be required to use drawing programs because they are more efficient and kids understand them better.
Photoshop and Illustrator for vector.
2D Design V2 Macromedia Fireworks
The Drawing Coach website has a free software drawing program you can download to help you learn the basics of drawing. The All About Drawing website also offers more free drawing software downloads.
u can go here put your games query here and search http://freegamesdownloadengine.org/
If your talking about Computer Drafting then i would suggest C.A.D.D. programs or the Inventor Programs
There are a number of commercial and bespoke software programs for CAD.
Chances are good that if you go to their website you'll find a downlaodable manual for your unit.
You can download mobile games right off of your phone's app store. Tablets also have app stores where games are available to download for free, as well as some that require purchase.