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.

Optimizely - A/B testing you'll actually use.

Sumo - Free tools to grow your email list.

Dynamic Yield - Personalization & customer experience management

Swiftype Site Search - Swiftype Site Search helps to sell more, get the right answer to more people on the platform and surface relevant content for readers and followers.

MooSend - Moosend allows you to design and send your email marketing campaigns and track the results from an easy-to-use web interface as well as a direct SMTP server connection for your smtp client or web application.