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Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
Leap - With Leap you find things based on your natural memory of that file.
DocuExpert - AI powered document processing and review software
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
Trainual + Slack Integration - Capture knowledge or access training right inside Slack
Elyse - The free version allows up to 30 tags.