PolyEdit is a simple and straightforward rich text editor and word processor. It has all the main features you would expect to get the job done. It's not bloated like Microsoft Word and it's very snappy. Unlike the page layout mentality of something like Word, PolyEdit focuses on the text itself. It's designed with writing and editing in mind.
Because of its slim and focused nature, PolyEdit is very easy to pick up and use. It will be very familiar to users of Microsoft Word, but even if you've never touched a word processor before, it shouldn't take long to start using everything in PolyEdit that you need.
Outside of the basics like font style, alignment, color, and lists that Word or Google Docs offers you, PolyEdit does have a few unique features. It has a tabbed interface so you can quickly and easily switch between working documents on the fly. It includes some great tools to work with text, including sorting, snippets, and a built-in clipboard manager. It also has a wide variety of plugins and additional tools available on the developer's site.
PolyEdit hasn't been updated in a long time, and its design looks a bit dated. It still has all the features you need to get writing done, but it seems unlikely that any new features or fixes will be added in the future.