Optmyzr - Optmyzr AdWords Tools. Optimization Solutions, Quality Score Tracker, Landing Page Checker, and more. Free Trial Available.
Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.
Freshmarketer - An all-in-one CRO suite.
Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.
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.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.