OmniOutliner - OmniOutliner is a writing app for collecting information, outlining ideas, adding structure to any sort of writing.
BlankPage - Stay motivated to write, and finish your story
Dynalist - Dynalist is a web app that lets you break down and organize your thoughts in the format of lists.
Novelize - Novelize is an online novel writing app designed to keep authors on track.
Outlinely - Indispensable information organization tool for knowledge workers.
Manuskript - Open-source tool for writers.