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.
FYI - Find your documents, like magic 🔮
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.
Findo - Your smart search 🔍 assistant across personal cloud ☁️
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
Vaultedge - Access all your documents in one place.