Thunderbird
Manage your calendar, contacts, and email inbox with a free client from Mozilla
HCL Notes
An email client built for enterprises that includes a large email server, messenger application and more
Mailbird
A high-performance desktop email clients for GMail and Microsoft Exchange users on Windows
eM Client
Email client packaged with other helpful features such as tasks, calendars, notes, chat, and more
Amazon WorkMail
A combined calendar and email program that helps you function efficiently
Airmail
A high-performance, streamlined email client with advanced spam filtering features for Apple smartphones, tablets, and laptops
Zimbra Desktop
Open source email solution for managing all email accounts in one fully-featured app
K-9 Mail
A leading open-source email client designed to save you time by letting you process your inbox in bulk
Mailspring
Easy-to-use email client that works in Windows, Mac, and Linux environments
BlackBerry Hub+
Android organization and consolidation app that includes many intuitive features and shortcuts for business productivity