Munt - Accept multiple cryptocurrencies with just 5 lines of code
AmzScope - Find profitable products for sale on Amazon in one click, relying on statistics instead of intuition
Fliqpay - Accept cryptocurrency payments worldwide
Jungle Scout - Amazon product research made easy.
Egrow - Egrow is a free web-based tool specifically developed for Amazon sellers.
AMZScout - AMZScout extension will help you make a decision about picking a niche based on the actual data, not intuition.