Open Live Writer is an open source application enabling users to author, edit, and publish blog posts. It is based on a fork of the well-loved but not actively developed Windows Live Writer code.

The best open source alternative to Post2blog is Open Live Writer. If that doesn't suit you, our users have ranked more than 10 alternatives to Post2blog and six of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Post2blog are SeMagic, Drivel, BloGTK and QTM.
Open Live Writer is an open source application enabling users to author, edit, and publish blog posts. It is based on a fork of the well-loved but not actively developed Windows Live Writer code.

Client for LiveJournal, Blogger, Wordpress Image upload to LJ Scrapbook, Flickr, fotki.com, imageshack.us, Picasa, Yandex Fotki.

Drivel is a GNOME client for working with online journals, also known as weblogs or simply "blogs". It retains a simple and elegant design while providing many powerful features, including: Support for LiveJournal, Blogger, MovableType, Advogato, and Atom journals...

BloGTK is a weblog client that allows you to post to your weblog from GNOME without the need for a separate browser window. BloGTK allows you to connect with many weblog systems such as Blogger, Movable Type, WordPress, and more.
MoPress is a blogging client application developed for mobile phones. It allows a mobile phone to post a content (text, image, audio, video) to a Blog, using any type of available network (mobile phone network or Wi-Fi network).