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.

Hunter - Find all the email addresses related to a domain

Nosto - Personalized shopping experiences for e-commerce businesses

Apollo.io - Apollo’s predictive prospecting, sales engagement, and actionable analytics help the teams to reach its full revenue potential.

Hawk Search - Site-search engine for eCommerce platforms.

Icypeas - This email finder has the capacity to bypass catch-alls