Teem - Cloud-based meeting room booking system
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
MeetingRoomApp - The best meeting and conference room booking system with a number of unique functions for effective meeting management and optimization of company processes.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Zoom.ai - Zoom.ai develops an artificial intelligence based automated virtual assistant.
The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.