Typesense - Typo tolerant, delightfully simple, open source search 🔍
Haystack Search - Haystack helps you make the most of your time, by searching all your files and documents in the cloud in one place. It's been built for privacy from the ground up, so your data isn't stored on a server, just your computer.
Meilisearch - Ultra relevant, instant, and typo-tolerant full-text search API
PDF Search for Mac - Search documents using Artificial Intelligence
SearchWP - Instantly improve the search experience of your WordPress site today with SearchWP, the best WordPress search plugin you can find!
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.