Greenboard - Generate beautiful static api documentation
Agenda - A date-focused note taking app for both planning and documenting your projects.
Archbee.io - Archbee is a developer-focused product docs tool for your team. Build beautiful product documentation sites or internal wikis/knowledge bases to get your team and product knowledge in one place.
Notepin - Extremely simple note-taking + blogging ✍️
You Need A Wiki - Create a wiki with Google Docs
Bear - Bear.app is a note-taking and content writing app that helps you boost productivity with its intuitive tools.