YWriter is free Novel writing software designed to keep your novel or story organized through one program. It helps eliminate the need to manage separate documents in programs like Microsoft Word. It has all the basics to keep your characters, plot lines, drafts, and locations organized.

Minimum System Requirements: Microsoft.net Framework (available for free from Microsoft), Windows 98 or greater and approximately a Pentium 4 with 512 MB of RAM or greater (it will run on slower machines).
Download Page: http://www.spacejock.com/yWriter5_Download.html

Quickstart Guide: http://www.spacejock.com/files/yWriter5Guide.pdf