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.
DocuExpert - AI powered document processing and review software
Yojimbo - Yojimbo makes keeping all the small (or even large) bits of information that pour in every day...
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.