DIdnt find anything where the whole thing could be integrated but apparently it can be stripped for parts!
I will let others comment on integrations they've used. I know some folks use Ring. Hubitat Safety Monitor can provide the basics on its own, though I have not seen any options for third-party monitoring. However, if you are ok self-monitoring (i.e. getting an alert on your phone), it might be a solution.
I use HSM in combination with a regular Ademco Vista 20 professionally installed and monitored security system. Works well but definitely not what you're looking for.
I use Konnected with all my existing door/window sensors, MIMO for my garage overhead door sensing, BlueIris connected to 15 different home/property cameras and have a Hubitat dashboard that brings all the sensors with panic alarm and bright house actions together. I use Pushover from Hubitat to get perimeter sensor notifications on my mobile. Also have BlueIris interface and that dashboard available on my phone, over a VPN connection only. Allows me to:
Get notified of activity.
Visually look at the activity.
Trigger scare tactics for the unwanted activity.
Report the activity to the police.
Edit...Forgot to add, I have some passive scare tactics automatically activated when the front door cameras sense activity. Basically turns on internal lights in the foyer and additional outside lights. This is through BlueIris and Hubitat integrations.
I have had the Ring alarm system for just over 1 year. I have never had a false alarm. The smoke detector listener works. The monitoring has called each time we set off the alarm by mistake. I use the Unofficial Ring Connect to allow Hubitat to monitor the Ring sensors and alarm status. I could not be happier with Ring or Hubitat!
I do pay for monitoring (which includes extended warranty) I am pretty sure you don't need monitoring for integration with Hubitat. If you don't want to pay the monthly monitoring fee, then there is no cost per month.