Claws Mail Visit Website Visit Website Open-source email application for Linux and Microsoft Windows operating systems; allows installation of themes and plugins
Best Office Software in 2026 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
