Kapta - Key account management software

Demandbase - Bizo

Zendesk - Zendesk is a beautiful, lightweight help-desk solution.

Engagio - Engagio is an account based marketing automation solution to engage target accounts and deepen sales-and-marketing alignment.

Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community

Terminus - Terminus is an account based marketing platform for B2B marketers.