Workflowy - A better way to organize your mind.
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
Conveyor - A development workflow that keeps you in the zone.
Trainual + Slack Integration - Capture knowledge or access training right inside Slack
Walling - Walling is your visual space to capture ideas and organize projects.
Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack