Typesense - Typo tolerant, delightfully simple, open source search 🔍
Web.dev by Google - Learn how to build for the web and see where you stand 🌟
Expertrec - Adds super fast search autocomplete, spell correct and search listing pages to your site search.
Sajari - Sajari is a machine learning powered search and matching service.
Appbase.io - Search stack for building modern apps
Reactive Search - UI components for building Amazon / Yelp like Search