Grsync is a simple graphical interface using gtk2 for the rsync command line program. it currently supports only a limited set of the most important rsync features, but can be used effectively for local directory synchronization.
When you don't want to use command line for backups, Grsync comes to the rescue :) Easy to use, yet powerfull, makes everyday backups easy. I use it to backup between to phisical drives in my PC, as well between PC and external HDD. Works fast and without any problems. GUI is little on the ugly side, but one can definitely live with it :)
Simple to use, yet featureful. Checkboxes for common/uncommon rsync options; text boxes for custom command-line tweaks. Works great for local backup (different drives/directories on 1 computer), as well as remote backup. Can delete extraneous files on the destination. Does not create an unwieldy metadata directory; you can delete files directly from the destination if you so choose, without messing everything up (though I've rarely had reason to do this). A few very minor eccentricities that have not been problematic for me. Much better than pybackpack and others I've tried!
An excellent choice for making rsync more user-friendly. Also shows you the rsync command before it is executed. Allows the user to add more CLI options that are not currently implemented in the GUI. Allows saving of sessions. Quite self-documenting. Best progress meter I have ever seen. Needs a bit of tweaking