Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Dynamic Yield - Personalization & customer experience management
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.
Site Search 360 - Site Search 360 enhances and improves your built-in CMS or product search with autocompletion, semantic search, filters, facets, detailed analytics, and a whole lot of customization options.
Sailthru - Sailthru Smart DataTM technology enables businesses to optimize, automate, and deliver personalized experiences to each individual at scale.