Crugo - Crugo is a simple group collaboration platform for your team
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.
Ripcord - A desktop chat client for Discord and Slack
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
Weavy - The complete white-label framework for in-app team messaging and collaboration.
Wondershare PDFelement - All-in-one PDF editor