Yes, both Nextiva and CircleLoop offer a Free Trial.
Nextiva is designed for Large Enterprises, Medium Business and Small Business.
CircleLoop is designed for Freelancers, Medium Business and Small Business.
Pricing for Nextiva Starts at $18.95/User/Month when Billed Yearly whereas for CircleLoop Starts at $6.45/User/Month.
Some top alternatives to Nextiva includes uContact, Call Center Studio, Grasshopper, Dialpad Contact Center, Vonage Contact Center, RingCentral Contact Center, ipSCAPE and OmniOMS Customer Communication Management Suite.
Some top alternatives to CircleLoop includes Nextiva, Dialer360, CloudTalk, HoduCC, Call Center Studio, TelebuHub, Truly, 3CX, My Hotline and CloudCall.