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Papermind - Papermind Slack App is a collaborative article-editing and document management platform for Slack
Wondershare PDFelement - All-in-one PDF editor
Trainual + Slack Integration - Capture knowledge or access training right inside Slack
Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.
TeamInk - Create, search and assign documents directly from Slack
Foxit PhantomPDF - Edit PDF files with our feature-rich PDF Editor. Download Foxit PDF Editor to convert, sign, scan / OCR & more. A speedy PDF Editor alternative to Adobe Acrobat.