
Postbox
Thunderbird
Mailbird
eM Client
Microsoft Outlook
ProtonMail
Apple Mail
Mailspring
kdiff3
Beyond Compare
WinMerge
Meld
Araxis Merge
DiffMerge
P4Merge
Devart Code Compare
Postbox
kdiff3Postbox is recommended for power users, professionals, and businesses that require advanced email organization features, customizability, and integration with other productivity tools.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Beyond Compare - Beyond Compare allows you to compare files and folders.
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
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.
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.