
Description: Simple Calendar is a free and open source calendar app for Android. It has a clean interface for viewing and managing events, supports calendar sync, custom reminders, and an optional weather widget. Simple Calendar is lightweight, customizable, and respects user privacy.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: GMX Calendar is a free, web-based calendar and scheduling service. It allows users to manage events, appointments, to-do lists, and share calendars with others. The service features calendar views, reminders, notifications, and integration with email.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API