kotsubu is GUI Twitter client written in Scala.
kotsubu is an open source software and free of charge.

Java SE 6 or higher.

Access folloiwng URL, then kotsubu will be automatically downloaded and run.
http://www.whiteboard.ne.jp/~admin2/kotsubu/kotsubu.jnlp

If it's a first run, please follow the steps below.

1. Since jar files were signed by self certificate, security alert dialog will pop up.
   If you think it's OK, please allow running this application.
2. Browser window will open and prompt you to allow kotsubu to access account.
3. Once you allowed, browser page will be redirected. Then, you can close the browser window.
4. Go back to kotsubu and close dialog window. Now you will see your friends timeline.

kotsubu is provided under Apache License 2.0.
kotsubu is an open source software and free of charge.
You can use kotsubu freely for any commercial and non-commercial use.

This program uses twitter4j and Scala.

Twitter4J
Copyright (c) 2007, Yusuke Yamamoto All rights reserved.
http://twitter4j.org

Scala
Copyright (c) 2002-2011 EPFL, Lausanne, unless otherwise specified.
All rights reserved.
http://www.scala-lang.org/

Also, it uses free icons from FAMFAMFAM - Silk Icons.
http://www.famfamfam.com/lab/icons/silk/