Attunity Replicate and Replicate Express software run on Windows and Linux environments.
As of this writing...(September 2015) the following are supported OS versions.

For Windows:
Windows Server 2008 x64, Windows Server 2008 R2 x64, Windows 7 x64, Windows Server 2012 and Server 2012 R2 x64. Windows 8.x is not yet supported.
For Linux, it supports:
Linux Red Hat 5.4 or higher

For more information please see: Specifications | Attunity