http://www.siebel.com
2. Amdocs
http://www.amdocs.com
3. PeopleSoft
http://www.peoplesoft.com
4. Oracle
http://www.oracle.com
5. SAP
http://www.sap.com
6. EDS
http://www.eds.com
7. Avaya
http://www.avaya.com
8. Baan
http://www.baan.com
9. Aspect
http://www.aspect.com
10. E.piphany
http://www.epiphany.com