Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
i3 - A dynamic tiling window manager designed for X11, inspired by wmii, and written in C.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
dwm - dwm is a dynamic window manager for X. It manages windows in tiled, monocle and floating layouts. All of the layouts can be applied dynamically, optimising the environment for the application in use and the task performed.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Openbox - Openbox is a highly configurable, next generation window manager with extensive standards support.