Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
SubscriptionZero - Declutter your Inbox by combining your newsletters emails
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
GoodByEmail - Declutter your inbox without giving third-party access to your emails! Reclaim GBs of storage, unsubscribe from pesky emails—all while keeping your emails off our servers. Experience full privacy with GoodByEmail, even offline!
Mailbird - Mailbird is the best email client for Windows 7, 8 and 10
The Email Game - Get to inbox zero with game mechanics