Yes, both Okta and RingCentral Office offer a Free Trial.
Okta is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
RingCentral Office is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Okta Starts at $2/User/Month whereas for RingCentral Office Starts at $19.99/User/Month when Billed Yearly.
Some top alternatives to Okta includes Oracle Identity Management, SailPoint IdentityIQ, WSO2 Identity Server, Keycloak, Azure AD, Ping Intelligent Identity, Ping Identity, Teamstack, Auth0, Frontegg and Login-Master.
Some top alternatives to RingCentral Office includes RingByName, VoIPstudio, Vonage Business, 3CX, 4PSA VoipNow, Infobip, Voxloud, MightyCall, Ringover, Voxbi and AT&T Office@Hand.