Algolia - Algolia's Search API makes it easy to deliver a great search experience in your apps & websites. Algolia Search provides hosted full-text, numerical, faceted and geolocalized search.
Klaviyo - Klaviyo helps brands own the customer experience, grow higher-value relationships, and deliver more personalized marketing experiences across email, mobile, and web.
Optimizely - A/B testing you'll actually use.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.
Dynamic Yield - Personalization & customer experience management
TargetBay - TargetBay is a complete eCommerce revenue generation platform.