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.

Docshare.tips - You can upload your documents.

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.

SlideShare - Discover, Share, and Present presentations and infographics with the world’s largest professional content sharing community.

Wondershare PDFelement - All-in-one PDF editor

DocDroid - DocDroid is a service for sharing document and slides.