Photon Chat is a ready-to-run, standalone and customizable text, voice & video chat script you can easily add into your own websites. This chat is a non-hosted solution. You can install and run this chat script on your own PHP5 web server.It will run without any problems on shared hosting

Photon Chat does not require expensive streaming servers (Flash Media Server or Red5). Users stream video directly to each other via peer to peer.

Photon Chat 5 has many powerful features such as 1 on 1 private chat rooms, full-screen video and voice calls, administration panel to kick / ban unwanted users and integration support for Wordpress, Joomla and others. The chat room interface design, size, colors, fonts, sounds and language are customizable. All editable script source files are included (Flash .FLA, AS3 Classes, PHP scripts).

FREE BONUS SCRIPT
When you buy Photon Chat 5, receive Virtual World Chat 1.2
for FREE! A $65 USD value.

http://www.photonchat.com/video_chat_features.html

You must be able to edit flash files ,if you dont have the software to edit,then dont buy this