Manuskript - Open-source tool for writers.
Toyhouse - Toyhouse is a platform that allows users to build up characters foe their games and stories.
FocusWriter - FocusWriter is a fullscreen, distraction-free word processor designed to immerse you as much as...
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
Byword - The easy way to write Markdown and rich text on your Mac and iDevices
Refsheet.net - Refsheet.