Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
DockbarX - DockbarX is a standalone dock that groups and launches applications.
Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Gnome-Pie - Gnome-Pie is a circular application launcher for Linux.
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.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.