AteoMessenger

If you're looking for a custom instant messenger application that supports video chatting, AteoMessenger might be the solution you're searching for. Not only can it send webcam frames through a direct connection between users, but it can also make use of a server connection in cases where a direct connection is not possible due to a firewall or gateway.

To install AteoMessenger, customers only need access to a shared PHP/MySQL server. The member database is owned by the customer, and there are a number of customizations available, including the ability to specify a custom application name, create custom advertising HTML content and upload unique emoticons.

Perhaps best of all, the package comes with source code for the server-side PHP files, which can help administrators to integrate it as a plugin or standalone application on any website. AteoMessenger includes a range of useful features such as buddy categories, online/offline indicators and popup notifications when contacts log on.

In addition, there's an HTML post section for messages, along with public chat capabilities, options to enable both P2P and server-based webcams, and the ability to choose which webcam device to use. Overall, this is an excellent option for anyone seeking a customizable instant messenger application with a range of useful features.