I want to second that I'm very excited about this. I've been looking for a tool to set up isolated native environments for a long time! I love the simple UI too.
I'd just like to add my votes for Redis and a menubar option. I tend to leave my stacks running all the time so having the app tucked away in the menubar would be great.
Another couple of services I'd like to vote for are Mailhog and Minio.