CRM One is described as 'Was developed to give sales departments in small to medium size companies the necessary tools to manage existing clients and to get new customers. "Don't pay for the features you don't need."' and is a CRM system in the business & commerce category. There are more than 100 alternatives to CRM One, not only websites but also apps for a variety of platforms, including Windows, Android, SaaS and iPhone apps. The best CRM One alternative is EspoCRM , which is both free and Open Source. Other great sites and apps similar to CRM One are Mautic, Twenty CRM, Pipedrive and Zoho CRM.