UltraDefrag is powerful Open Source defragmentation tool for Windows NT. It's engine is very fast, because it is created as kernel-mode driver. They are three interfaces to them: graphical, console and native. First is very useful, because it use cluster map visualization. Console is good for task scheduler, and native tool - for advanced users and programmers.
Design of the UltraDefrag is very ergonomic: no skins, no localization, no animation and so on. It's true small and powerful program! It can be used on Windows 2000, Windows XP, Windows Server 2003,Windows Vista and all of the 64-bit editions of Windows. NT 4.0 support is currently unavailable.
The main news in 1.0.5 are:
120 DPI bug fixed
drive letters assigned by subst command excluded
small console bug fixed
Tools and Utilities
Product page: here