Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Flowroute - Flowroute provides direct access to telephony resources - such as calling, messaging (SMS & MMS), call routing, SIP Trunking and Communication APIs.
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.
Tatango - Tatango is a mobile messaging platform for agencies.
Creativity 365 - Cross-device content creation suite
Postscript - Like Mailchimp for SMS