One Call Now - One Call Now's message notification delivers automated phone calls, SMS text messages and emails within moments to any group.
Robinhood - Free stock trading service.
Notifuse - A 1-to-many notification API that's simple to use
Rally Rd. - Invest in blue-chip classic cars like stocks
OnPage - OnPage critical alert and incident management system enables rapid resolution of critical IT, healthcare or IoT incidents through efficient communication.
Freetrade - Invest in stocks & ETFs for free, get started in seconds.