Toyhouse - Toyhouse is a platform that allows users to build up characters foe their games and stories.
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.
World Anvil - World Anvil is a worldbuilding tool for Authors, Storytellers and worldbuilding lovers.
BlankPage - Stay motivated to write, and finish your story
Refsheet.net - Refsheet.
Manuskript - Open-source tool for writers.