autoComplete.js - Simple autocomplete pure vanilla Javascript library.
Searchkit - UI components for Elasticsearch
React-InstantSearch by Algolia - The easiest way to add lightning-fast search to React apps
Appbase.io - Search stack for building modern apps
Mixpeek - Mixpeek is an API that enhances your app with a search engine that spans all your image, audio, video and PDF files regardless of location.
X to Elasticsearch Sync - CLI for importing MongoDB, SQL, CSV, JSON to Elasticsearch