AbiWord - AbiWord is a free software word processor.
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
LibreOffice - Writer - Open-source cross-platform word processor.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
iA Writer - Minimal Design, Maximum Focus
Apache OpenOffice - Apache OpenOffice is an open source, office document productivity suite.