Great tutorial on making a custom post-type plug-in.
This makes the magic happen and can allow you to respond on your site to an other site and you can show up as a comment.
If you are a #WordPressTheme developer you should recommend people install this theme.
This is the indieauth plug-in. It allows you to use your domain to sign in to other domains if you have a rel=me link.
This plugin is an open API that will let you publish to WordPress with third party clients Ryan Barret
Since the plugn accesses an API you should include a recommendation with your theme that people download and activate the theme.
If you install the #indieWeb plugin a link to install micropub is included.
This is the IndieWeb plugin as a theme developer if you include an h-card natively and a rel=me link you may not need to encourage people to use this plugin.
However it converts the profile page to include the rel=me and has an h-card widget. If you don't want to add that just include the plug-in with your theme.
The pubsubhubbub plugin will ping other services when you publish a post.
Thanks Matthias Pfefferle