
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: SIGAINT is an email service launched in 2014 that offered encrypted and anonymous email accounts. It was known for its privacy features and for being used by activists and journalists to protect communications.
Type: Cloud-based Test Automation Platform
Founded: 2015
Primary Use: Web, mobile, and API testing
Supported Platforms: Web, iOS, Android, API