Use blocks, and, optionally, « short-form » post types to easily « IndieWebify » your WordPress site.
IndieBlocks registers several blocks (Bookmark, Like, Reply, and Repost, as well as the older Context block) that take a URL and output corresponding microformatted HTML.
In combination with a microformats-compatible theme, these help ensure microformats clients are able to determine a post’s type.
It also comes with « short-form » (Note and Like) custom post types, and a (somewhat experimental) option to add microformats to (all!) block-based themes.
These microformats, in combination with the Webmention protocol, allow for rich cross-site conversations. IndieBlocks comes with its own Webmention implementation, but a separate plugin can be used, too.
IndieBlocks also registers several « theme » blocks (Facepile, Location, Syndication, and Link Preview), to be used in « block theme » templates.