HubSpot CRM - Free CRM software for small businesses.
Django - The Web framework for perfectionists with deadlines
Less Annoying CRM - A simple customer relationship manager made just for small businesses. Manage contact info, track leads, and never miss a follow-up.
Flask - a microframework for Python based on Werkzeug, Jinja 2 and good intentions.
Keap - Grow Sales. Save Time. Get Organized.
Sprucely.io - Sprucely.io is a flexible platform service that automates your data insights pipeline. It turns your data into interactive decision intelligence. In seconds.