I'll jump in here and mention Moose OS. It's a debian based open source OS that allows you to run these agents, and whatever OSS container you want. You can start with the hosted version and move to your own box at any time.

I think lock in in is the thing we should try to avoid from now on, especially when it comes to our personal data. Products like muse and dots are attractive when they have a free tier but someone always needs to pay the bill.