Priax (aka Flizy) is a Free multiplatform IAX2 client written in C, using libiaxclient and SDL. Its in early stage of development. It runs on Linux and win32 systems, coming with an NSI installer and configurator for the last.
At this time there are no releases, just subversion access through the command: svn co https://svn.sourceforge.net/svnroot/priax priax