Abode is a DIY security system which can be self-monitored, or professionally monitored.  With self monitoring, the system has integration with Google, Alexa, and Homekit, but with as little as $6/month Abode can be integrated into other home automation systems such as Home Assistant.  The real value comes in when going to the Pro monitoring.  The closest competitor with similar features is Simplisafe, but ultimately I went with Abode for the integration and I haven't had any issues.