Twilio - Brings voice and messaging to your web and mobile applications.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Plivo - Plivo simplifies your customer engagement.
Creativity 365 - Cross-device content creation suite
SendBird - SendBird is messaging-as-a-service.
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.