Yes, there is Synergy. We know. But try ShareMouse first and then compare, please.
* ShareMouse supports Drag & Drop of files in BOTH directions.
* OSX Mavericks support
* No configuration required
* Works in any direction (no "slave"/"master" thing)
* Clipboard sync including formatted text and bitmaps
* Free for 2 computers (learn more at http://www.keyboard-and-mouse-sharing.com/freeware.htm)
* And many more: http://www.keyboard-and-mouse-sharing.com/features.htm