Freeware caution: always scan free downloads of anything for bugs and other threats before dumping the programs into your hard drive.

The Hemingway Editor is an app to help improve the quality and clarity of your writing; it not only counts your words and grades their readibility, but highlights problem words or phrases that are difficult to read, are written in passive voice, contain adverbs, etc.

Still in development but very interesting, Manuskript writing freeware offers an outliner to help you organize your story ideas and elements, a mode where you can write without distractions, and a novel assistant that uses the Snowflake method of outlining and plotting to tackle story development.