Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
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.
Geary - Geary is an email application built for GNOME 3.
Microsoft 365 - Boost your productivity with reliable access anywhere with services like email, calendar, file sharing, meetings, instant messaging, and Office Online
Airmail - Airmail is a lightweight and lightning fast mail client for Mac.
ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.