In the case of freemium, the product that I have found useful for my sales outreach is ContextSmith’s free email tracking for Gmail. It is convenience for me to know which mails my prospects opens and clicks on so as to understand their level of engagement. Review collected by and hosted on G2.com.

It still feels quite limited in terms of the ability to export the data that ContextSmith gets to learn about users. You cannot export per-interaction engagement data for going further in other CRM or marketing automation tools conveniently. Review collected by and hosted on G2.com.