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.
V12 Data - V12 Data offers rich data sets with verified addresses and emails for personalized marketing campaigns.
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Adobe Audience Manager - Adobe Audience Manager is a data management platform that integrates online and offline data to deliver a unified view of all your audiences
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.
Clearbit - Clearbit provides Business Intelligence APIs