CKEditor - Real-time collaborative future-ready rich text editor
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.
Summernote - Summernote is a JavaScript library that helps users create WYSIWYG editors online.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Froala Editor - Froala Editor is a WYSIWYG HTML editor that enables rich text editing capabilities for the applications.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.