Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.
Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.
Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.
Freshmarketer - An all-in-one CRO suite.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.