Teem - Cloud-based meeting room booking system
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BOOKMEETINGROOM.COM - Book Meeting Room - Conference & Meeting Rooms Management
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Meetio Room - Meeting Room Booking System
eM Client - eM Client is a fully-featured email client for Windows and macOS with a clean and easy-to-use interface. eM Client also offers features for calendars, tasks, contacts, notes, and chat.