Agile CRM is a privately held software-as-a-service (SaaS) company that specializes in customer relationship management software. The company offers sales, marketing and service CRM for small businesses.

HubSpot is a platform that offers marketing, sales, customer service, and a full CRM software to help businesses grow.

NetHunt is a smart CRM for Gmail and Google Apps users. It turns emails into the CRM records to let you manage your business using only the Gmail inbox.