To uninstall the Remobo application itself on MAC, you simply delete it from the Application Menu.

Remobo uses TunTap drivers for MAC OSX. To remove them, you have to delete these files manually:

/Library/Extensions/tap.kext
/Library/Extensions/tun.kext
/Library/StartupItems/tap
/Library/StartupItems/tun

Administrator Privileges are needed to delete these files. Currently Remobo does not remove these files automatically, since they may be used by other 3rd-party applications. Comments/suggestions are welcome to improve this uninstall process.