SvxLink is a ham radio repeater controller and a general voice services system with features such as EchoLink and voice mail. There is a lot of changes in this release since there has been a while since the previous release. See the ChangLog for all the details.
The SvxLink project can be used as a replacement (and more) for the Windows only closed source EchoLink application. To get started, have a look at the SvxLink homepage: http://svxlink.sourceforge.net/