Twilio - Brings voice and messaging to your web and mobile applications.
Zapier - Connect the apps you use everyday to automate your work and be more productive. 1000+ apps and easy integrations - get started in minutes.
Bandwidth - Bandwidth offers SIP trunking, Emergency communications, and Voice & Messaging APIs.
ifttt - IFTTT puts the internet to work for you. Create simple connections between the products you use every day.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
Microsoft Power Automate - Microsoft Power Automate is an automation platform that integrates DPA, RPA, and process mining. It lets you automate your organization at scale using low-code and AI.