Optimizely - A/B testing you'll actually use.
Klevu - Klevu offers instant site search solution for eCommerce stores.
Evergage - Evergage's real time web personalization software can help you boost engagement, increase revenue and drive more conversions. Web personalization software that's easy to use.
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.
Qubit - Qubit is a web personalization platform founded by former Google workers, using innovative technology to collect, store, process, and output data to optimize consumers' experiences on the web. Read more about Qubit.
Google Custom Search - Google Custom Search enables you to create a search engine for your website, your blog, or a collection of websites.