Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
InVision Studio - The world’s most powerful screen design tool
Quip: Team Documents for Slack - Create, share and get notified about Quip docs in Slack
Inspect by InVision - A magical new design to development workflow from InVision
Workflowy - A better way to organize your mind.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.