PIPEDRIVE CRM

It's BY FAR one of the best CRM. Sales Pipeline Focused, full featured.
And you can integrate with, for example, Active Campaign, for Full Marketing Automation.

The only thing missing is a great DashBoard like Dasheroo.

Develop this integration and you will see a BIG flow of new sign ups for your Software.

BTW - I'm not affiliated. Just a Big fan from Brazil.