FCKeditor (retired)
HTML5 editor, free and open-source website builder based on Silex
An OpenSource (C# .NET) TeamPlay Environment.
Contao Open Source CMS (fka TYPOlight)
Ukrainian localization for project www.question2answer.org
Form Maker
WordPress event calendar plugin
PXell - Online project management.
Fully customizable web chat created using AJAX.
The leading Open Source survey tool