Free defragment software for windows

DefragMentor Lite CL is a free command line file defragmentation tool that will help you defragment a single file or a group of files as well as to obtain information on file and disk fragmentation. DefragMentor Lite CL (where CL stands for Command Line) is a perfect tool for automated file-based defragmentation.
Even if you defragment the entire disk on a regular basis, some frequently changed files become fragmented long before the next launch of disk defragmenter. So you can use DefragMentor Lite CL to optimize placement of individual files thus reducing access time and improving overall performance of your system. Database files of any kind (especially large ones) are the best example of what DefragMentor Lite CL can optimize.
Instead of running DefragMentor Lite CL manually every time you need to defragment files you can schedule a task, which Windows will run for you automatically at any convenient time. Use the standard Windows task scheduler if you want to work in this way.

Buzzsaw On-The-Fly Defragmenter allows you to defragment your drive while you work.
Buzzsaw had on-the-fly defragmentation before any defragmentation program on the market made it available. This program runs at idle priority so you can continue working without Buzzsaw using your valuable CPU time. It watches the drive for modified files and waits approximately 60 seconds before defragmentation begins.
It waits, because you may be downloading a file, etc. and there is no need to defragment the file if it is going to be modified again shortly. If you are a developer, you may be compiling files, or saving files frequently which is another reason for delayed defragmentation.

MemDefrag 1.1 is a console application that defragment windows memory. Users that can have advantage of this application can be user who runs real-time synth applications on "slow" computers with "low" memory(64MB), before running the applications. A person I know told me that the "FruityLoop" stopped "hacking" if he run MemDefrag before he starts FruityLoops Pro...

AutoDeFrag is a launcher for the standard defragmenter built into Windows 2000. The standard defragmenter does not support the ability to be scheduled, and therefore must be manually launched when required, once for each fixed disk in your system. AutoDeFrag works around this limitation and allows the Windows 2000 Task Scheduler to be used to schedule the defragmenter. By default, lunching AutoDefrag will defragment all drives, however you can specify in the command line, if you only want a selected drive defragmented. Very simple tool, but a great aid in maintaining performance.

JkDefrag GUI is a convenient GUI (Graphical User Interface) for JkDefrag JkDefrag GUI is a convenient GUI (Graphical User Interface) for the "JkDefrag", which is a free (GNU GPL) disk defragment and optimize utility for Windows.
JkDefrag is a Free (released under the GNU General Public License) disk defragment and optimize utility.
Completely automatic and very easy to use, fast, low overhead, with two optimization strategies, and can handle floppies and USB disks/sticks.

RAM Def will defragment your RAM when reaching a warning level, or silently (with command line parameters). It excels in terms of reliability and speed and the full support it offers to its users, with help files, a troubleshooting guide, tips and online assistance, guarantees you peace of mind along with XTreme performance.
The latest version (2.71) is a rebuild of the classic RAM Def; it offers support for multiple languages both in the UI and the installer/uninstaller. All the code has been revised and improved, the package redesigned and the online support updated.
Main features:
- Monitors RAM usage
- Defragments & cleans RAM
- Full system tray support
- Multiple languages support
- Complete documentation
- On-line support