Yes, both Nextiva and ZIWO offer a Free Trial.
Nextiva is designed for Large Enterprises, Medium Business and Small Business.
ZIWO is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Nextiva Starts at $18.95/User/Month when Billed Yearly whereas for ZIWO Starts at $109/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 ZIWO includes Nextiva, TalkDesk, Calabrio One, CallTools, uContact, CloudTalk, Call Center Studio, Dialpad Contact Center, Callision, RingCentral Contact Center and CallMatrix.