StackAdapt - Native advertising demand side platform.

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.

Nativo - Nativo is an advertising technology platform for brand advertisers and publishers to scale, automate, and measure native ads

Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.

Zemanta - Zemanta is an online content and links suggesting platform that provides a plugin to the bloggers, publishers and other types of content creators.

ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.