Yes, Nasm(and Fasm) are "raw assemblers". It's possible to write any sort of app that can be made with either of them. The only slightly hard part about writing apps that use libraries in asm is that you have to specify the libraries you want to import, which is usually handled for you by HLL compilers.
Intel probably does gave an assembler since they have a compiler, but I've never heard of anyone using it.
Fasm also has a cmdline version, I just suggested the IDE b/c it's easier and has a "Compile and Execute" button for quick return.
