Currently confd ships binaries for OS X and Linux 64bit systems. You can download the latest release from GitHub
$ wget https://github.com/kelseyhightower/confd/releases/download/v0.7.1/confd-0.7.1-darwin-amd64
$ wget https://github.com/kelseyhightower/confd/releases/download/v0.7.1/confd-0.7.1-linux-amd64
$ ./build
$ sudo ./install
Get up and running with the Quick Start Guide.