AddThis - AddThis free website tools include share buttons, targeting tools and content recommendations help you get more likes, shares and followers and keep them coming back.
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.
Sharingbuttons.io - Quickly generate social sharing buttons with a tiny performance footprint.
Optimizely - A/B testing you'll actually use.
AddToAny - Share buttons by AddToAny, the universal sharing platform for websites and apps.
Dynamic Yield - Personalization & customer experience management