1. Aspect Software
2. Genesys
3. International Business Machine Corporation
4. Marketo Inc
5. Microsoft Corporation
6. Nuance Communications Inc.
7. OpenText Corporation
8. Oracle Corporation
9. Pegasystems Inc.
10. Pitney Bowes Inc.
11. Salesforce Inc.
12. Verint Systems Inc.
13. Zendesk Inc.
14. Zoho Corporation