Guide to voice over IP software

Guide about Voice over IP software.

Complete

 * OpenWengo produces Wengo Phone supports SIP protocol - on windows/linux/macosx/firefox_extension
 * Ekiga - full SIP and H323 protocols - soon on windows (old gnomemeeting)
 * kphone - using SIP? for linux/KDE
 * Gizmo - linux/windows/mac proprietary software (free of price)

Old/limited

 * linphone - SIP protocol?
 * gyach enhanced - works on the yahoo messenger neetwork for voice/video
 * gaim-vv - adds voice to Gaim
 * Open Source VOIP applications

Non standard protocols

 * pY - chat with yahoo voice on linux...
 * ihu - simple and practical solution when there is a firewall