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Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Teem - Cloud-based meeting room booking system
Geary - Geary is an email application built for GNOME 3.
BOOKMEETINGROOM.COM - Book Meeting Room - Conference & Meeting Rooms Management
Evolution - Apps/Evolution - GNOME Wiki!
Skedda - Offices, co-working spaces, universities, sports venues, studios & churches are just some of the places that manage the use of their desks, rooms, courts, studios, halls and all other 'spaces' with Skedda