A list of the engineering, design, etc contests that I know of here, for future reference.

This focuses on contests that are among one or more of the following categories

• Students/Corporates/non-students
• Allow international participation
• Have some kind of prize associated with them

Engineering

• IEEE Presidents Change the World competition
• Intel/Cornell embedded design cup
• Disney Imagineering

Hack-a-thon style

• Trojan Hack

Programming

• ACM ICPC - The mother of all coding competitions and probably the single toughest and most prestigious in the world.
• CodeSprint
• Facebook Hacker Cup

Training/Practice for programming contests

• UVA problem sets
• Project Euler
• TopCoder