Is there a way to install gcc in OSX without installing Xcode?

Checkout command line tools for Xcode from apple. It's official support from apple to only create the command line tools.

Try the osx-gcc-installer on github.

I'm fairly certain that this is not possible. However, I'm also not sure if you need the whole developer suite to get the developer tools installed. Quite a few tools get installed along with XCode that might be optional. However, I think you're out of luck for not needing to bite the bullet and use wget or DownThemAll or some other download manager that will let you slowly download the developer tools in chunks.

Whenever I install OS X I install the developer tools as a rule, just because it opens up the world of available software tremendously. Perhaps you should consider doing this in the future as well.

I've been doing this for a long time, and I've done things like this, and I've concluded it's simply never worth doing. :-(

The reason is that no one expects you to do such things, so there are assumptions all over the system that "everything" is there. You might not run into this today - or worse, you might not even realize later that this is the cause of your issues.

Instead of wasting your smart time on things like this which don't actually produce any working code you can use, following the approved method, run the download overnight, and spend your time instead on planning and writing the top-level code (you shouldn't need a compiler for that anyway!)