Unison File Synchronizer
Finally a tool that allows me to synchronize files both Windows and Linux clients without any worries.
Unison shares a number of features with tools such as configuration management packages (CVS, PRCS, Subversion, BitKeeper, etc.), distributed filesystems (Coda, etc.), uni-directional mirroring utilities (rsync, etc.), and other synchronizers (Intellisync, Reconcile, etc).
It installs as an native Windows application.