I've been so frustrated looking at the commercial options in this space. The one I like the most (customer.io) has gone completely "Call Us". For some reason I just balk at and freeze up. I never end up filling out those forms, even though it's never a high bar to get me to input my email address on a site I find even remotely interesting.
I made a list of "things that need a high quality open source version" and this was at the top of the list. I've looked and looked at some of the more established options, but they seem like too much software for what I want.
I'm looking forward to trying it out when we launch our cloud version soon.