Firepad - Open source collaborative code and text editing that relies on Firebase for real-time data...
Google Calendar - Spend less time managing your day & more time enjoying it
CryptPad - CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
eduPad - Real-time collaborative text-editor. No account required. Edits highlighted in authors color.
iCal - In Calendar on your Mac, subscribe to calendars published or shared by others.