UltraDefrag is an Open Source disk defragmentation tool that offers fast defragmenting, using a kernel based driver. It offers a simple GUI with a cluster map display, as well as a command-line interface and scheduling option. The software supports full defragmentation and space defragmentation (compacting), and allows you to include/exclude files or folders based on their name or size. Other features include HTML reports and boot time defragmentation.

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. Its true small and strong program!

UltraDefrag Features:
1. very fast defragmentation, because engine is kernel mode driver
2. and has optimal algorithm.
3. very small engine written in pure C language.
4. nice graphical interface - compact and comfortable.
5. safety, because file moving is realized with special system calls.
6. simple to use.
7. generate html reports.
8. has useful filters.

The license of this software is Free, you can free download and free use this system optimizer software.