I wanted to clarify that odrive will still run on 10.7 - 10.9, but it will be missing the context menus and overlays.
For those interested, I created a few (“unofficial”) simple service scripts this morning that can be added to Finder to allow right-click sync, unsync, refresh, and status for these older versions of OS X, using the CLI underneath. Definitely not as nice as the native Finder integration context menus, but it is an OS X supported way to add right-click menu options to Finder. I did these quick, so there is room for improvement and enhancement, but they work. 
Unzip, double-click on the workflow file, and choose “Install”.
