| Office Line CRM | ATUS AG |
| OMbusiness | Creativ Software AG |
| OMcube | Creativ Software AG |
| OMfundraising | Creativ Software AG |
| OMmember | Creativ Software AG |
| OpaccOne Frontoffice WebCRM | Opacc Software AG |
| openCRX | CRIXP Corp. |
| Oracle CRM | Oracle Software (Schweiz) GmbH |
| Oracle CRM On Demand | Salesforce.com @ NEXELL GmbH |
| Oracle CRM OnDemand | Full Speed Systems AG |
| Oracle on Demand | Oracle on Demand @ Nexell GmbH |
| OrgaSales CRM-Suite | ProTeam Business Solutions GmbH |
| Outlook CRM / Business Contact Manager | KMU Business Technologie Netzwerk |
| Outlook Infodesk | Fischer Software GmbH & Co. KG |
