Feeder by Reinvented Software - Feeder is for creating, editing and publishing RSS feeds on macOS.

RSSme - RSSme is free, lightweight and user-friendly RSS editor.

Marvin Classic - Marvin Classic is free to use the web and mobile application specially designed for ebook lovers who want to read, manage, and download new ebooks.

Drivel - Drivel is a GNOME client for working with online journals, also known as weblogs or simply...

MarsEdit - MarsEdit is a desktop blog editing application for the Mac. It provides an offline interface to most popular blogging systems. WordPress, Blogger, Tumblr, Movable Type, and many other systems are supported.

ecto - ecto is a feature-rich desktop blogging editor for MacOSX.