Simplex Defragmenter is a freeware GUI (Available for both x32 and x64 platforms) for the excellent JkDefrag .Simplex defragmenter is written in .NET and emphasizes on simplicity of usage. It is provided and maintained by Touradg Morassaei.
Current Release 1.5

Simplex and JkDefrag are completely free at no cost and no time limit. The executables are released under the GNU General Public License. Although thoroughly tested but I do NOT ACCEPT any responsibility for the damages may cause by Simplex and/or JkDefrag.

Thanks to Dylan Eiler (Colorado, USA) for x64 release Beta testing.

For more info and support on JkDefrag please visit here.