SvxLink is a ham radio repeater controller and a general voice services system with features such as EchoLink and voice mail. The biggest change in this release is an improved DTMF decoder. Other than that it's mostly bug fixes and compatibility changes. 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/