Is it possible to connect WooCommerce/OpenCart with MailBluster?

You can use MailBluster with WooCommerce/OpenCart using a 3rd party tool called Make (formerly Integromat). The following link will help you with connectivity and integration using MailBluster: https://www.make.com/en/integrations/mailbluster.
Also, you can check out this detailed guide and how to use Make (Formerly Integromat) with MailBluster: https://mailbluster.com/blog/connect-thousands-of-popular-apps-services-with-mailbluster-via-integromat/.
We also have a video tutorial on this which shows how to import Leads from Google Sheet to MailBluster using Make (formerly Integromat): https://youtu.be/BxSmrLNeqnU.