Twilio - Brings voice and messaging to your web and mobile applications.
OneLogin - On-demand SSO, directory integration, user provisioning and more
Nexmo - Nexmo is a simple two way SMS API with global reach and wholesale rates
TeamPassword - TeamPassword helps you manage and share access to the apps, services, and tools your team needs to keep projects moving.
BulkSMS - SMS messaging service provider offering two-way SMS communication services.
Teramind - Teramind provides a user-centric security approach for monitoring.