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.
FYI - Find your documents, like magic 🔮
Searchbase - Build Search UIs with drag and drop
Findo - Your smart search 🔍 assistant across personal cloud ☁️
Sajari - Sajari is a machine learning powered search and matching service.
Vaultedge - Access all your documents in one place.