Google Calendar is described as 'Manage events efficiently with device syncing, Gmail integration, event reminders, and shareable schedules on a user-friendly interface with dark mode' and is a leading Calendar app in the office & productivity category. There are more than 100 alternatives to Google Calendar for a variety of platforms, including Web-based, iPhone, Android, iPad and Mac apps. The best Google Calendar alternative is Etar, which is both free and Open Source. Other great apps like Google Calendar are Proton Calendar, Fossify Calendar, Calendar Lock PEA and Tuta Calendar.
Free online scheduling tool for groups showing collective availability through a shared link without requiring accounts, simplifying coordination for events, trips, or meetings and reducing messaging by letting all participants easily mark open dates.
Take control of your schedule and get reminded wherever and however you want. Instantly access your appointments, tasks, and notes with a simple glance at a transparent calendar that sits right on your Windows desktop.
Your calendar, on steroids. Enhance your productivity and organise your time with Vimcal touted to be the quickest and fastest calendar app ever.
Android calendar-app showing the weeks of the year (week numbers), 21 languages, syncable with Google Calendar:
Cron Calendar brings the power and design of Cron’s macOS and Windows app to your phone. Schedule meetings and control your time like never before. Cron deeply integrates with Google Calendar accounts so that all your events and resources are synced.
Ulti-Planner is a new modern calendar app with best-in-class features. We have spent years perfecting our new flagship product with speed, power, and flexibility. Features include full year, month, timeline day, week, and agenda list views to display your events and reminders...
Zoho Calendar is an online calendar that helps you stay organised. Zoho Calendar makes scheduling events & appointments, sharing team calendar, booking resources easy & effortless. With over 15 million happy users, we are equipped to cater for different needs - Personal...
Popular calendar app integrating Google, Live, Outlook, iCloud, Exchange, Office365, and Facebook into an easy overview. Manage appointments, events, and birthdays seamlessly with customizable views and notifications. Optimized for both personal and professional use.
Amie is a productivity application that facilitates task, event, and contact management, integrating a scheduling feature for task and event time allocation, and effectively transforming the calendar into a todo list, with color-coding for improved organization and visual...
Rise Calendar is a state-of-the-art scheduling tool that utilizes a Scheduling Engine to pinpoint the best times for meetings and tasks that require concentration. Its unique focus blocks feature progressively limits access to your calendar as it becomes fuller, protecting your...
Web-based time-management tool featuring appointment scheduling, sharing, reminders, to-do list integration, iCalendar file import, collaborative options, multiple calendar creation, recurring events, and cross-device access for both personal and organizational use.
Business Calendar for Android is a complete calendar application that synchronises with your Google calendars.
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It's the closest free alternative to Google Calendar that I have found.