Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.

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

DownToMeet - DownToMeet is a platform to organize, find, and attend group events.

Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.

Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.

Mailbird - Mailbird is the best email client for Windows 7, 8 and 10