Word processing software is defined as a computer program that lets you type words or text which shows up in a virtual "document" on your computer screen which can, in turn, be printed or sent electronically.
Framapad
Framapad is a collaborative notepad which allows to distinguish author by color.
Microsoft Word is one of the most famous word processing software. It allows to write down text and shape it. It also allows other people to review and comment the text.