I'm writing an architecture/technical documentation for an inhouse project and I'm becoming more and more frustrated with Microsoft Word as I seem to use most of my time getting things to align correctly. Word has horrible usability issues but I didn't come here to rant, rather I'd like to know whether there exists something more suitable for the job.

The point of this documentation is to provide a "big picture" of the system, and as such I'm not generating documentation from source code but rather writing it all by hand.

Are there any alternatives to Microsoft Word for writing properly formatted technical documentation with less frustration?