Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.

Q-Stats - Get free marketing insights for every question on Quora.

Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.

HypeStat - HypeStat is free statistics and analytics service, where you can find information about every website.

Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.

Site Rank Data - View historical rank information of websites via time series charts.