Mailspring - Mailspring is a mail client for Mac, Windows and Linux.

YArooms - YArooms is a web based booking software package that makes it easy for you to manage rooms and...

Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!

BOOKMEETINGROOM.COM - Book Meeting Room - Conference & Meeting Rooms Management

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.

Resource Central - Meeting room & resource scheduling software for Outlook