Any alternatives to the OminSend free plan for Customer Flows with WooCommerce?

From the information I've gathered, this seems to offer the best free plan that works with WooCommerce / WordPress - a little low on the SMS, but that's somewhat to be expected.

Can anyone point out some alternatives, so I can have a better knowledge of the options out there, in case there are changes in the near future? Or if I'm missing out on something?

Appreciated in advance.