Klevu - Klevu offers instant site search solution for eCommerce stores.
Dynamic Yield - Personalization & customer experience management
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Sailthru - Sailthru Smart DataTM technology enables businesses to optimize, automate, and deliver personalized experiences to each individual at scale.
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.
Qubit - Qubit is a web personalization platform founded by former Google workers, using innovative technology to collect, store, process, and output data to optimize consumers' experiences on the web. Read more about Qubit.