UltraDefrag is a powerful Open Source Defragmentation tool for Windows Platform. It can defragment any system files including registry hives and paging file. Also one of the main goals of UltraDefrag is doing the job as fast as possible.

There are three interfaces to them: graphical, console and native. The first is very useful, because it uses cluster map visualization. Console is good for task scheduler, and native tool - for advanced users and programmers.

UltraDefrag´s design is very ergonomic: no skins, no localization, no animation and so on. It´s a truely small and powerful program!

Features

• very fast defragmentation, because engine is kernel mode driver and has optimal algorithm.
  
• very small engine written in pure C language.
  
• nice graphical interface - compact and comfortable.
  
• safety, because file moving is realized with special system calls.
  
• simple to use.
  
• generate html reports.
  
• has useful filters.
  
• free: distributed with full source code under the GNU General Public License.