Cvent - Cvent's event management software provides event planners with a complete solution to increase event attendance and decrease event costs.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
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.