Atom Publishing Protocol

 Atom Publishing Protocol  is an IETF standard API for CRUD operations between blogging client and server software, RFC 5023, and supported by Blogger and MarsEdit.

Clients

 * MarsEdit

Services

 * Blogger

Servers
No known server software supports AtomPub.

History
AtomPub was adopted by Blogger to replace their original XML-RPC Blogger API.