CIM3 - CIM3 provides a secure and centrally managed Business Instant Messaging Solution (server/client), including Chat, Voice / Video Conferencing, File Transfer, Emoticons, Dictionary and Tools add-in function etc.
Silky - Silky is a secure chat client for SILC (Secure Internet Live Conferencing) protocol. The code is written in C and the GUI is implemented using the GTK toolkit. Supported operating systems include Linux and Windows.
Every attempt has been made to provide you with web conferencing software that is free and without time limits or other limitations.
eGroupWare - eGroupWare is a multi-user, web-based groupware suite developed on a custom set of PHP-based APIs. Currently available modules include: email, addressbook, calendar, infolog (notes, to-do's, phone calls), content management, forum, bookmarks, wiki.
OpenH323 provides full featured, interoperable, Open Source implementation of the ITU H.323 teleconferencing protocol that can be used by personal developers and commercial users without charge.