What are best ROI aps for emarketplace that would streamline operations or increase conversion?

Shopify Apps
1

What are best ROI aps for emarketplace that would streamline operations or increase conversion?
What are the common hacks for limited plans?

2

We use shopify to manage our marketplace, with sellers & Buyers from different countries - what is the best way to handle:

  • Taxes
    • We want to use an app that manages all the different tax rules that may apply per transaction.
  • Shipments
    • What are the best apps to handle this
    • Every product is very different - may need refrigerated conditions, fragile, normal shipment, etc…
  • Translations
    • We work predominantely in the EU, and would like an internal app that would automatically translate our website to any language