The IndieWeb is a people-focused alternative to the "corporate web". These standards are organized roughly in order of age and breadth of implementation.
The Webmention Standard defines a simple way to notify any URL when you link to it from your site.
The Micropub Standard defines a protocol used to create, update and delete posts on one's own domain using third-party clients.
The WebSub Standard defines a notification protocol between publishers of any kind of Web content and their subscribers, based on HTTP web hooks.
The JF2 Standard describes a JSON serialization format to describe simple streams of data as well as single objects of data for data transfer and processing.
The IndieAuth Standard defines an identity layer on top of OAuth 2.0, primarily used to obtain an OAuth 2.0 Bearer Token for use by Micropub clients.
The Vouch Standard defines an anti-spam extension to Webmention.
The Salmention Standard defines a protocol extension to Webmention to propagate comments and other interactions upstream by sending a webmention from a response to the original post when the response itself receives a response.
The Microsub Standard defines a standardized way for clients to consume and interact with feeds collected by a server.