1. AWeber Communications Inc.
2. Brevo
3. Campaign Monitor Pty Ltd.
4. Constant Contact Inc.
5. Emma Inc.
6. Epsilon Data Management
LLC
7. GetResponse S.A.
8. Google LLC by Alphabet Inc.
9. HubSpot Inc.
10. iContact
LLC
11. International Business Machines Corporation
12. Intuit Inc.
13. MailerLite
14. Mailgun Technologies Inc.
15. Microsoft Corporation
16. Omnisend
LLC
17. Oracle Corporation
18. Pinpointe On-Demand Inc.
19. Polaris Software
LLC
20. Salesforce Inc.
21. Sitecore
22. Teradata Corporation
23. Twilio Inc.
24. VerticalResponse Inc.
25. Webengage
26. Zoho Corporation Pvt. Ltd.