Toolchains for STM32

Hi. I am a little bit confused.

Why there is so many toolchains for ARM and what are the differences betwen them?

Lastly i heard abot Yagarto, and also these is WinARM, arm-gcc, arm-none-eabi-gcc. Are they all the same? which toolchain should i use?

I also heard about somethink called cygwin, what is that?

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Associate III

Can you give a link, i can not find it.

Senior III

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