Yes, both ZIWO and Zendesk Talk offer a Free Trial.
ZIWO is designed for Large Enterprises, Medium Business and Small Business.
Zendesk Talk is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for ZIWO Starts at $109/User/Month whereas for Zendesk Talk Starts at $9/User/Month.
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.
Some top alternatives to Zendesk Talk includes Nextiva, TalkDesk, uContact, HoduCC, Call Center Studio, TelebuHub, Zendesk Support, VoxDesk, Zendesk Chat and Freshdesk Contact Center (Formerly Freshcaller).