Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Azor - Azor: Al uw projecten, processen en klanten voor al uw medewerkers in één pakket
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Avenue right - Avenue right is a media buying and digital advertising platform that helps businesses make better decisions with the right advertising.
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.
Simple Estimate - Improve Estimation Accuracy, Reduce Errors, and Speed Up Your Sales Process.