Markdown by DaringFireball - Text-to-HTML conversion tool/syntax for web writers, by John Gruber

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.

Textile - Textile is a lightweight markup language originally developed by Dean Allen and billed as a...

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.

GitHub Flavored Markdown - GitHub uses "GitHub Flavored Markdown," or GFM, across the site--in issues, comments, and...

Wondershare PDFelement - All-in-one PDF editor