Wondershare PDFelement - All-in-one PDF editor

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.

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.

Calligra Office - Calligra Office that is also called as Calligra Suite is the pack of multiple applications and tools that are being offered by the MS Office Suite.

Pages - Pages for Mac is a word processor that offers tools needed to create documents.

Zettlr - Write Markdown documents with a comprehensive GUI and many workflow/time management tools.