
Description: Vivaldi Webmail is a free, open-source webmail client developed by Vivaldi Technologies. It offers an intuitive interface, support for multiple accounts, calendar and contacts syncing, and custom themes.
Type: Open Source Test Automation Framework
Founded: 2011
Primary Use: Mobile app testing automation
Supported Platforms: iOS, Android, Windows

Description: Inout Webmail is a free, open-source webmail client that can be self-hosted. It has a simple, easy-to-use interface, supports multiple email accounts, contacts, calendar, and more. Good alternative for those looking to host their own webmail service.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API