Novelize - Novelize is an online novel writing app designed to keep authors on track.
Dabble Writer - Writing software for novelists.
StoryMill - Developers and publishers of Mac, Win, and iOS productivity, home and office and writing software such as MacGourmet, Paperless and many more. Based in MN.
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding
Manuskript - Open-source tool for writers.
BlankPage - Stay motivated to write, and finish your story