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.
Dabble Writer - Writing software for novelists.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
Manuskript - Open-source tool for writers.
SHAXPIR - A modern cloud workspace for fiction writing & worldbuilding
oStorybook - oStorybook : a free Open Source novel writing program for creative writers