G2Crowd - software review platform - Marketing Automation Software Comparison Overview 

Leaders products include: HubSpot, Pardot, Marketo, Act-On, and Oracle Eloqua.

High Performers products include: LeadSquared, Salesfusion, Net-Results, OutMarket, SharpSpring, ONTRAPORT, ThriveHive, Autopilot, Hatchbuck, Right On Interactive, eTrigue, and ActiveDEMAND.

https://www.g2crowd.com/categories/marketing-automation