S o f t w a r e

Game maker studio

Game Maker Studio,
provides more capability, flexibility, and productivity than any other Game Development IDE I've ever used, heard of, or seen.
And... It's FREE!
You can get it here:

Get it now!

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Caustic 3.0

Caustic is the best music production application I have ever found! It runs on just about every platform known to man including but not limited to: Windows, Mac, Android, and IOS.  It's free for computers and $10 for mobile devices.
You can get it here: 

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caustic

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audacity

Download here:

Audacity

Audacity is a free audio editing program that is productive, fast, and efficient. I have used it for most of my games and it has proven very useful. You can get it for Mac or Windows.

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GIMP

Download it here:

GIMP

GIMP is a free GNU image manipulation program. ( Highly professional. ) Runs on most operating systems including Windows, Mac, and Linux. You can learn all about it here at the GIMP website