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.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Criteo - Build, scale, and activate first-party audiences with The Commerce Media Platform.
Klevu - Klevu offers instant site search solution for eCommerce stores.
Campaign Monitor - Email marketing software built for designers and their clients to run successful email campaigns.