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HoudahSpot - Advanced File Search Utility for Mac OS X
Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
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
TaskSurfer - TaskSurfer gives you all of the tools you need to manage things the way you want.
TeamInk - Create, search and assign documents directly from Slack