Here’s a list of 20 applications that allow you to create blog posts from the comfort of your operating system environment, no internet connection required.

Mars Edit 2: Mac

Mars Edit is among the most popular desktop blogging apps for the Mac. It supports all of the major blogging platforms such as WordPress, Blogger, and Drupal and even many of the newer ones like Squarespace and Tumblr. Composing a blog post in Mars Edit can be as simple as writing an email but there are enough advanced features like macros (reusable snippets) and TextWrangler integration to keep professional bloggers happy.
Price: $29.95

Flock: Mac & Windows

I know this doesn’t strictly fit the category of a desktop blogging app, but it is a desktop app and it does have blogging integration… so there. Flock is the most unique web browser I’ve ever come across and is absolutely worth checking out. The thing that makes Flock unique is that it has integrated tons of the services you use online into the browser itself (by default). This means you can browse the web while keeping tabs on your social networking and blogging services. The built-in blog editor isn’t as fully featured as Mars Edit, but as a free utility bundled in a browser it’s pretty impressive. Check out all the services Flock supports below. Price: Free


Flock Services

Ecto: Mac

Ecto is a surprisingly fully featured blogging application with support for a ton of platforms. Ecto features include both a rich text editor and an HTML editor, full local control of recently posted entries and drafts, and the ability to convert and scale images. In my own testing Ecto seemed a bit rough around the edges but it’s definitely a good alternative to Mars Edit if you’re looking for something a little cheaper.
Price: $19.95

Qumana: PC & Mac

Qumana is another free option with most of the necessary features we’ve already discussed: WYSIWYG and HTML editor, support for most major blogging platforms, and local control of previous posts. What sets Qumana apart is its emphasis making money with your blog. Qumana lets you easily include ads in your posts so you can (theoretically) earn cash as viewers click on the ads.
Price: Free

Blogo: Mac

Blogo breaks ground in the interface category by delivering a slick, minimal UI for updating your blog. Blogo supports Wordpress, Blogger, Typepad, Typo, Drupal, Expression Engine, Twitter, Ping.fm and more. Notable features include a bookmarklet to easily grab content from your browser, a fullscreen editing mode and easy drag and drop photo uploading/resizing.
Price: $25

MacJournal: Mac

MacJournal is geared more towards private journaling than professional blogging, but it does include full support for LiveJournal, Blogger, Movable Type, and WordPress. MacJournal takes full advantage of OS X by offering features like Quicklook integration and iSight compatibility.
Price: $39.95

BlogJet: Windows

BlogJet is one of the nicer Windows-only options that I came across. BlogJet sports a ton of great features including posting to multiple blogs simultaneously, Flickr and YouTube integration, file sharing/attachments for your readers to download, and browser/feed reader integration. And of course, support for WordPress, TypePad, Movable Type, Blogger, MSN Live Spaces, Blogware, BlogHarbor, Squarespace, Drupal, Community Server, etc.
Price: $39.95

RocketPost

Another really impressive Windows only app, RocketPost claims to be the “only one with WYSIWYG editing, full local editing and full blog import.” RocketPost boast tons of top notch features like automatic linking to related posts, quote tracking, quick linking, auto save, instant photo album creation, and scheduled posts. If you’re on Windows and are serious about blogging, this may be the way to go.
Price: $29

And a Bunch More!

After you’ve listed the features for eight desktop blogging apps, things start to get redundant. So I’m going to stop there and let you check out the rest. The apps above are the ones I found particularly impressive or unique, but here’s another 12 that are definitely worth looking into.