Yes, both Jungle Scout and AMZ.One offer a Free Trial.
Jungle Scout is designed for Medium Business and Small Business.
AMZ.One is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Jungle Scout Starts at $19/Month when Billed Yearly whereas for AMZ.One Starts at $15/Month when Billed Yearly.
Some top alternatives to Jungle Scout includes Sellics, AMZ.One, Marketplace Manager, AMZScout, AMZ Alert, AMZInsight, Helium 10, Optiseller, ProfitGuru and AMZRank.
Some top alternatives to AMZ.One includes Jungle Scout, RankActive, Outrankio, Sellics, K-meta Tool, Ranktracker, AMZ Alert, AMZInsight, AMZRank and Semrush E-Commerce Apps (Sellzone).