GNU Project begins work on totally free Skype alternative
Dubbed GNU Free Call, the program will rely on a "self-aware, meshed calling network" to deliver secure, anonymous VoIP. The GNU SIP Witch server will provide the back end, which will be extended to communicate with peers and cache routing information.
The aim is to deliver a cross-platform experience, so smartphone clients are in the work as well -- and with this being a GNU project, the open-source Android is a likely target. Other platforms which don't play as well with FSF and GNU licensing probably won't get in on the action.