Google Calendar - Spend less time managing your day & more time enjoying it
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...
Calcurse - Calcurse is a calendar and scheduling application for the command line.
Calendar Lock PEA - Calendar Lock PEA is an encrypted desktop calendar with a day, week and month view. The shown calendars are never stored unencrypted on your disk, but exist only in the RAM. Platform-independent, Open Source, no installation or registration required.
Notiv - Notiv is the intelligent meeting assistant that captures and automatically transcribes all your essential voice conversations into clever business outcomes.
Morgen.so - All-in-one Calendar, Tasks & Scheduler. Morgen is the single hub for everything that revolves around time management.