Guava - Google core libraries for Java 6+.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Quarkus - Quarkus: Supersonic Subatomic Java. . Contribute to quarkusio/quarkus development by creating an account on GitHub.
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.