Thunderbird - Thunderbird is a free email application that's easy to set up and customize - and it's loaded with great features!
Sleep Cycle - Bio-alarm clock that wakes you up at optimal times based on your sleep patterns.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Sleep as Android - Common alarm clocks ignore your sleep cycles, they wake you on schedule no matter your are currently in your deep sleep. Waking up from deep sleep is unpleasant, it makes you tired and it may negatively affect your productivity during the whole day.
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.
Talalarmo - Minimalistic android alarm