TiddlyMap - An interactive concept- and mind-mapping plugin for the personal note-taking software TiddlyWiki based on the Vis.js library. It's free and open-source!

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.

Wisdomap - Wisdomap Medicine is a study aid that helps medical students create differential diagnoses and suitable management plans from a presenting complaint and structured revision notes.

Novelize - Novelize is an online novel writing app designed to keep authors on track.

IOctopus - IOctopus is an online mind map service for a dive deep into the mind for the best ideas.

Manuskript - Open-source tool for writers.