Twilio - Brings voice and messaging to your web and mobile applications.
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
Plivo - Plivo simplifies your customer engagement.
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
LightShot - The fastest way to take a customizable screenshot.