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.
Big Huge Labs Writer - Writer is a free online distraction free writing environment provided by Big Huge Labs.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Office Online - With Office Online you can view, edit, and share Word, Excel, PowerPoint, and OneNote files on your devices using a web browser, so you can work anywhere.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
Caret - Better Markdown Editor for Mac / Windows / Linux