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ONLYOFFICE - ONLYOFFICE is a complete office and productivity suite.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
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.
WPS Office - Would you need Office Word, Excel or PowerPoint for Home, business or School? WPS.com would give you right version for you.
Evolution - Apps/Evolution - GNOME Wiki!