LIbreOffice is an open source word processor suite and it’s completely free. Design-wise it may look a bit dated, but in terms of features it has got almost every trick in the book, except cloud-based services that means it does not have features like real-time collaboration, cloud storage sync, mail or calendar sync.
It is a completely offline tool, available in 110 languages and supports Windows, Mac, Linux, Android and iOS. LibreOffice uses its own file format ODF, but it supports all the Microsoft Office formats.
