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.
Klevu - Klevu offers instant site search solution for eCommerce stores.
Dynamic Yield - Personalization & customer experience management
Optimizely - A/B testing you'll actually use.
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.
Yuzu - An experimental open-source emulator for the Nintendo Switch