Pleroma

 Pleroma  is an open source, federated social network implementation compatible with Mastodon and GNU social.

Features
Pleroma focuses on being a light and generalized implementation of ActivityPub, in contrast to Mastodon (which focuses on microblogging).


 * Profile
 * Posts. Pleroma has support for
 * note
 * article
 * page
 * photo
 * video
 * Specifications
 * ActivityPub
 * Activity Streams 2.0 — a variety of Objects, see post types above

Instances
Instances can be found on various trackers:
 * https://fediverse.network/pleroma
 * https://the-federation.info/pleroma
 * http://distsn.org/pleroma-instances.html

IndieWeb Support
(this section is a stub, please update with new information with citations)
 * no known IndieWeb building-blocks support.

To Be Proposed
These are ideas/suggestions for Pleroma to support more IndieWeb building blocks. Feel free to file them in https://git.pleroma.social/pleroma/pleroma/-/issues and then move them (and their issue link) to the Requests section below.
 * IndieAuth support (both sign-in with IndiAuth, and use of a Pleroma profile as an IndieAuth identity to sign-in elsewhere)
 * Micropub server support
 * Webmention support, sending & receiving for posts and profiles

Requests
TBD.

Internal Architecture
The Pleroma codebase has a clean separation between server and client, so an admin can install multiple frontends.

In addition to the default PleromaFE, it comes installed with a customized Mastodon frontend, called the MastoFE. The Pleroma contributors have said their goal is for Pleroma to be an unopinionated social server that can fill multiple niches, e.g. Twitter-like, Facebook-like, Instagram-like, etc.