Where can I download GNU assembler?

Yes, Gas is the same as GNU assembler. It's part of the binutils package, and can be downloaded at ftp://ftp.gnu.org/gnu/binutils/ (together with many other tools, like the GNU linker). Mind you, it's intended to run under Unix-like operating systems, like Linux (where it's included by default due to dependencies).

It's not good for beginners, as it's intended more to be used as a backend by GCC (GNU compiler collection) than as a stand-alone by people, and therefor make some assumptions -- like that you know what you're doing and that you don't need verbose error-messages.

NASM (http://www.nasm.us/) is better suited for actually writing programs manually in, and it's available for Windows also.

Gnu Assembler

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RE:

Where can I download GNU assembler?

Is Gas is the same as GNU assembler? Where can I download it? And, is it good for a beginner? If not, where should I start?

GNU as is a part of the binutils package at http://www.gnu.org/software/binutils/

I don't believe that it is the same as gas. As to whether it is good for a beginner depends on the rest of your skillset. If you're already familiar with various gnu tools, then it should be on a similar level to learn as other assemblers.

http://www.gnu.org/software/binutils/