Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack

TagSpaces - TagSpaces is an open source platform for personal data management. With TagSpaces you can manage and organize the files on your laptop, tablet or smart phone.

Trainual + Slack Integration - Capture knowledge or access training right inside Slack

TagFlow - TagFlow is an intelligent files manager that use tags for organize your documents.

TeamInk - Create, search and assign documents directly from Slack

Tabbles - Tabbles use tags to organize and find files along with your colleagues.