yWriter is a writing tool that uses "scenes" as a unit of text and allows you to associate that text with all manner of story elements (characters, locations, items) as well as place it and rearrange it within the context of chapters
yWriter is a word processor which breaks your novel into chapters and scenes, helping you keep track of your work while leaving your mind free to create. It will not write your novel for you, suggest plot ideas or perform creative tasks of any kind. yWriter was designed by an author, not a salesman!
Manuskript combines concepts and functions of yWriter, Novel Factory and Scrivener. It's a bit rough in its presentation, but a good alternative for anyone who can't decide between the aforementioned tools.