Yes, both Twilio Frontline and Zipwhip offer a Free Trial.
Twilio Frontline is designed for Large Enterprises, Medium Business and Small Business.
Zipwhip is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Twilio Frontline Starts at $20/User/Month whereas for Zipwhip Starts at $35/Month.
Some top alternatives to Twilio Frontline includes Apollo.io, AroundDeal, CrankWheel, ZoomInfo Engage, Microsoft Dynamics 365 for Sales, Salesinteract, EngageBay Sales CRM, SalesCRM, SalesLoft, Salesvue, Closely, RingCentral Engage Digital, SalesReach and SalesHandy.
Some top alternatives to Zipwhip includes CometChat, Podium, MOBtexting, SimpleTexting, Twilio Flex, SMS.to, TextMagic, Buddy Texts, Cloudli TalkNText and CloudContactAI.