Yes, both Microsoft Dynamics 365 for Sales and RingCentral Office offer a Free Trial.
Microsoft Dynamics 365 for Sales is designed for Large Enterprises, Medium Business and Small Business.
RingCentral Office is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Microsoft Dynamics 365 for Sales Starts at $65/User/Month whereas for RingCentral Office Starts at $19.99/User/Month when Billed Yearly.
Some top alternatives to Microsoft Dynamics 365 for Sales includes Salesforce Sales Cloud, Pipedrive, Thryv, Vendasta, ClickUp, Zoho CRM, Freshsales, Salesforce, SalesCRM, SimpleCRM, Simply CRM, Client Book CRM, webCRM, Snapforce CRM, DigitalCRM.com, CRM.io by 500apps and CRMSuite.
Some top alternatives to RingCentral Office includes RingByName, VoIPstudio, Vonage Business, 3CX, 4PSA VoipNow, Infobip, Voxloud, MightyCall, Ringover, Voxbi and AT&T Office@Hand.