Beyond Compare - Beyond Compare allows you to compare files and folders.
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.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online