Mibew Messenger (also known as Open Web Messenger) is an open-source live support application written in PHP and MySQL. It enables one-on-one chat assistance in real-time directly from your website.

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Stable:
Mibew Messenger 1.6.3, October 14, 2009 (requires PHP and MySQL)

Localization packages:

Arabic 1.6.3 October 14, 2009
Bulgarian 1.6.3 May 02, 2010
Catalan 1.6.3 May 02, 2010
Deutsch 1.6.3 October 14, 2009
Dutch 1.6.3 February 17, 2010
French 1.6.3 October 14, 2009
Hebrew 1.6.3 October 14, 2009
Hrvatski 1.6.3 October 14, 2009
Hungarian 1.6.3 May 02, 2010
Italiano 1.6.3 October 14, 2009
Polski 1.6.3 October 14, 2009
Português Brasil 1.6.3 October 14, 2009
Romanian 1.6.3 May 02, 2010
Russian 1.6.3 October 14, 2009
Spanish 1.6.3 October 14, 2009
Swedish 1.6.3 May 02, 2010
Thai 1.6.3 February 17, 2010
Simplified Chinese 1.6.3 October 14, 2009
Traditional Chinese 1.6.3 October 14, 2009
Ukrainian 1.6.3 October 14, 2009

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Desktop tray application for Windows:
Mibew Tray 1.1.0 beta, May 28, 2009 (requires .NET Framework 3.5 and Windows Installer 3.1)