I’ve been building Interdatum CRM primarily for small service businesses, and figured [r/CRM](r/CRM) might have some useful feedback.
The idea is pretty simple: a lot of small businesses don’t need a $50–100/user/month CRM. They need somewhere to manage leads and customers, send estimates/invoices, schedule work, keep everything organized, and automate repetitive stuff.

So I built Interdatum with a pretty substantial free tier:
Contact and lead management
Estimates and invoicing
Scheduling / job management
Customer portal
Forms
Email campaigns
Documents and photos
Workflow automations
Basic reporting

There are also integrated payments and phone/SMS features that have usage-based costs, but the goal is to keep the actual CRM useful without requiring a monthly subscription.

I’ve been using it for service businesses myself, so a lot of development has basically come from “this is annoying, I’m going to automate it.”
It’s still relatively new and I’m actively building it. I’d genuinely appreciate feedback from people here who have used or administered a lot of CRMs—especially what you think is missing or what would prevent you from actually using it.

Happy to answer technical/product questions too.