gamemaker, you don't need to know code, and it's possibilities are near endless
http://www.yoyogames.com/gamemaker/
There are some good game making software programs which are free and not Game Maker 1.8. Free game making software can be found at YoYo Games Game Maker Studio and The Game Creators.
Many companies create game making software. Depending on the type of game console or if it is for an online game, it will use different game making software.
Free game design software can be found online on freeware websites. However do not go online and download software that you know is illegal, That would be bad.
Every Mac comes with the X Code development software. There are many other options depending upon what kind of game you want to make and how good a programmer you are.
Free backup software is available in a lot of places. Just look for free external cloud storage. Cloud computing is the wave of the future and you can be ahead of the game.
First you have to have a special game making software such as "gamemaker" and others. Next you make the game. Then if you have a website, you can post it on. There are free website creaters such as "freewebs", and "zoomshare."
There are some different sites and places on the internet for finding game making software. Some are: game editor, the game creators, yoyo games, or even garage games.
There is no software which will convert a PS2 Game Disc into a PC game Disc. PS2 emulation could allow a PC to play a PS2 game if you could find and download a reliable emulation
http://www.apple.com/downloads/macosx/development_tools/powergamefactory.html
The only one that I know of is a 3d software that will take a very long time to learn. It is called blender and it can be found at blender.org
Yes, game developers use special software in order to create video games. This software is usually designed by the company making the game.
I don't use those, since I am a programmer myself and I prefer to write all the code, but I can suggest a place where you could find one. Go to sourceforge.net. It has thousands of free software of any kind for any operating system. You should be able to find any kind of software you are searching for on that website. It has everything, and everything there is free and open-source. SourceForge even has a whole software category for code generators, it should contain game makers and some of them should have versions for Mac OS X.