Apps similar to Calendar Lock PEA include Google Calendar, which is free for personal use. Other options are Fossify Calendar, Etar, KashCal and Fantastical. There's no shortage of Calendar Apps like Calendar Lock PEA, with more than 50 alternatives for the web, Android, Mac, Windows and iPhone.
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United States
A focused desktop calendar for local events, Google Calendar and CalDAV. Open source, cross-desktop and made to feel at home on Linux.
Calendar-On-Demand is a sleek, transparent desktop calendar widget designed to help you stay focused and organized without breaking your workflow.
South Korea
Atomcal is an events management platform (calendar app) that allows you to connect with Google calendar in real time and have your events on the platform sync with your communities on Discord and Twitch.
RemindMe is a windows desktop application that will notify you of events that you created using this application. RemindMe will create a popup on the middle of the monitor you have your mouse cursor on(if you have multiple monitors).
