Yes, both Jungle Scout and Optiseller offer a Free Trial.
Jungle Scout is designed for Medium Business and Small Business.
Optiseller is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Jungle Scout Starts at $19/Month when Billed Yearly whereas for Optiseller Starts at $29.17/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 Optiseller includes Jungle Scout, Cenports, SellerCenter, Zoho Commerce, Marketplace Manager, Equip, MyEasyStore, Epsilo, iSeller, SellerApp and Omnyfy.