Vox Gratia

For more information on Open Source VoIP projects, see the follow links:

 
OpalVoip
OPAL
Open Source Voice, video and fax over H.323, SIP
 
H323plus
H323plus
OpenH323 continued
 
Ekiga
Ekiga
Open source VoIP client using OPAL
 
GnuGk
GnuGk
H.323 Gatekeeper using H323plus

For historical information on the OpenH323 project, see the following links