I tried out JkDefrag 3.16 today and it looks pretty good so far. The only minor gotcha is that the GUI version only looks at the C: drive by default. But, that is a minor issue and can be addressed from the command line.

It is not as fast as Auslogic but seems to be more, hmm, complete in its attempt to defrag a hard drive. I also like the inclusion of a screensaver version of the application that can run during idle time.