Searching on terms 'blog editor linux' I found these somewhat outdated links Five Desktop Blog Editors for GNU/Linux Users and Five More Desktop Blog Editors for GNU/Linux Users
Having a list is better then having zillions google links.
* GNOME Blog Entry Poster
* Drivel Journal Editor
* BloGTK Blog Editor
* ScribeFire Firefox Extension
* Google Docs as a Blog Editor
* Flock’s Blog Editor
* QTM for KDE Users
Hope too check these out to find the best drupal match.
One question remains circling my head. Why do I want/need a tool like these? Why not just use drupal for it :)