Hypothes.is’ reply will get you most of the way, but I’ll add some additional thoughts below.
— Hypothes.is (@hypothes_is) January 5, 2017
For Hypothes.is, I use the plugin referenced in the tweet above, but I’ve also been using Hypothes.is Aggregator by Kris Shaffer. I will note that the latter broke for me recently (possibly with the upgrade to WP 4.7, but I’ve filed a ticket and hopefully it’ll get sorted shortly). Shaffer’s plugin also makes using and posting with Hypothes.is’ Chrome extension more useful and interesting to me, since I can own copies of my highlights/annotations on my own website.
I’m hoping that sometime soon that Hypothes.is highlights and annotations on pages will also support sending webmentions so that when someone annotates one of my pages that I’ll receive a notification about it, almost as if it were a comment. If you’re interested in this sort of thing, Kartik Prabhu has a fantastic write up and some code on mixing marginalia and webmentions which I’m hoping to implement sometime soon myself.
If you need any help with any of the above, I (and surely others) are happy to help you via IndieWeb Chat.