OpenTween is an open source Twitter client with settings that offer many features and flexibility. In 2011 when Tween became closed source, it was created by forking. For the current development status, please refer to OpenTween-dev ML.
This project can also be found on GitHub.
==== Ver 1.0.0(2012/03/30)
* 相変わらずオープンソースです。
* NEW: OpenTweenのアイコンが追加されました
* CHG: バージョン番号の表記を変更しました
* CHG: bit.ly短縮におけるプライバシー問題の対処としてAPIキーの指定を必須としました
http://sourceforge.jp/projects/opentween/lists/archive/dev/2012-January/000020.html