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.
Open Live Writer - Open Live Writer makes it easy to write, preview, and post to your blog.
Desk - An award-winning & beloved desktop publishing client, exclusively for OS X.
Drivel - Drivel is a GNOME client for working with online journals, also known as weblogs or simply...
Scrivener - Scrivener is a content-generation tool for composing and structuring documents.
Joplin - Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, tagged and modified either from the applications directly or from your own text editor.