Boostnote - Boostnote is an open-source note-taking​ app.
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.
Supernotes - The fastest way to take notes and collaborate with friends. Create notecards with Markdown, LaTeX, images, emojis and more. Get started for free!
BlankPage - Stay motivated to write, and finish your story
Draft - A tool for developers to create cloud-native applications on Kubernetes
Manuskript - Open-source tool for writers.