Klevu - Klevu offers instant site search solution for eCommerce stores.
Blinkist - Key insights from 6,000+ bestselling books and podcasts
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.
Sipreads - Takeaways from the best books, for free 📕⚡
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.
Four Minute Books - Making you smarter in 4 minutes or less.