The program is far (very far) from being usable, but I wanted to put a non-development version out there. But still, consider it a demo version.
You can get the code from Qt-apps.org: http://qt-apps.org/content/show.php/Dianara?content=148103
Keep in mind that a lot of the buttons and other widgets are placeholders with no real use at the moment.
What you can do is configure your account, authorize the program to access your account, see the last 20 posts in your timeline, post text-only messages (with some HTML formatting), and see the list of people you follow.