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.
Elucify - A completely free software tool that uses crowdsourced data to find business email addresses
Optimizely - A/B testing you'll actually use.
Lead Forensics - B2B website analytics and lead generation.
Dynamic Yield - Personalization & customer experience management
FindThatLead Prospector - Feed your sales team with daily leads.