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