1. SuiteCRM
2. CapsuleCRM
3. Insightly
4. Really Simple Systems
5. FreeCRM
6. Bitrix24
7. Raynet
8. vTiger
9. ZohoCRM
10. Zurmo
11. Hubspot CRM
12. InStream
13. High Rise
14. Sugar CRM
15. Splendid CRM
16. OpenCRX
17. EspoCRM
18. Xtuple.