Nextopia - eCommerce Site Search & Navigation
Nosto - Personalized shopping experiences for e-commerce businesses
Hawk Search - Site-search engine for eCommerce platforms.
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.
UNBXD - eCommerce site search, navigation and personalization
RichRelevance - MyBuys