Smartlook

BigCommerce is an eCommerce solution that runs on its own servers — so you don’t have to buy web hosting or install anything on your computer to use it. With tons of built-in features, data tools, and more, BigCommerce is best for large or fast-growing businesses.

Klaviyo is the best in class email marketing solution for eCommerce. It's powerful because it connects to your store, and you can create awesome customer segments based on past purchasing behaviors, customer preferences, and even future predictions of spending.

HubSpot is an award-winning inbound sales, marketing, service, and CRM platform, that helps businesses implement inbound in their businesses. It's used across all industries, but for eCommerce it's typically integrated with WooCommerce.

With Mailchimp you can send newsletters and automated emails. You can build your email list with form or import your known contacts. Mailchimp offers pre-designed email templates and a drag and drop email builder.

Gorgias

Gorgias is of the most popular helpdesks for D2C brands. It centralizes all your support tickets in one place and enriches them with lots of extra context about a buyer's profile. Through Gorgias, you can connect directly to your eCommerce store and edit orders, modify subscriptions, and refund payments without leaving your helpdesk.