h4k.com

ExamDiff is a freeware text file comparison software for Microsoft Windows. It is an easy to use tool with a clear display of differences between files. ExamDiff also has command line capabilities.

http://www.prestosoft.com/ps.asp?page=edp_examdiff

Unlocker is a free, closed-source, Microsoft Windows application for regaining control over locked files. There are many ways that files can be locked in Windows such as sharing violations, permission errors, or system usage. This program unlocks these files so that they may be altered or deleted and works great when manually removing spyware or viruses from infected Windows computers. Unlocker has won many web awards from various shareware and freeware websites. The home page provides a convenient chart comparing Unlocker to its’ competitors showing why it is the best in the market.

http://ccollomb.free.fr/unlocker/

Darik’s Boot and Nuke (DBAN) is a utility for completely destroying all the data on a hard drive. To use the program simply download the file, write it to a floppy, blank CD, or USB drive and then boot the computer to the newly created media. It is easy to use with on-screen instructions and works by overwriting all the data on the hard drive multiple times with various patterns and random data. DBAN is commonly ran on used hard drives that may be sold or given away so that none of the data can be recovered. This application destroys all data on the hard drive, including any installed operating systems, and should be used with caution.

http://dban.sourceforge.net/

Windows Sysinternals are a set of powerful Windows utilities that “help you manage, troubleshoot and diagnose your Windows systems and applications”. There are dozens of free, light-weight applications available here separated into the following categories:

• File and Disk Utilities
• Networking Utilities
• Process Utilities
• Security Utilities
• System Information
• Miscellaneous Utilities

Any Windows network administrator, security professional, developer, or technical support analyst will be able to find many useful tools here.

http://technet.microsoft.com/en-us/sysinternals/default.aspx

Log Parser is a free, closed-source Windows utility for parsing through many different types of logs using SQL like queries. It can change the input to a different type of output to easily create reports or charts with large data sets.

Available here:
http://www.microsoft.com/technet/scriptcenter/tools/logparser/default.mspx

Official forum:
http://forums.iis.net/default.aspx?GroupID=51

A simple and functional hex editor for Linux.

Command line install:

sudo apt-get install ghex

XML2CSV by A7Soft is a free command line XML to CSV converter for Windows. This utility can use elements of an XML structure as variables to quickly turn an XML file into a CSV report. The application includes usage documentation and a series of excellent examples.

http://www.a7soft.com/xml2csv.html

AccessEnum is a free tool for Windows to view all the permissions set on a specific directory in a Windows environment. This tool helps locate variations and improper permissions set throughout a file system.

http://www.microsoft.com/technet/sysinternals/FileAndDisk/AccessEnum.mspx

KPDF is a powerful PDF reader for Linux that is easy to use. It is just as fast as the default PDF reader that comes installed with Ubuntu, Evince, but it actually offers a friendly interface and has a variety of options to choose from.

http://kpdf.kde.org/

Command line install:

sudo apt-get install kpdf

When files are put online they are sometimes compressed to make the transfer of the file that much quicker and use less bandwidth or simply to put multiple files in a single file. RAR is a compression format that is sometimes used to do this. There are multiple tools available to extract the data or files from a RAR file. Due to the proprietary nature of the format there are free tools that are able to unarchive RAR files but not archive with RAR. If you need to archive files there are many other open, more popular non-proprietary formats available such as ZIP compression that should be used instead.

Linux: Unrar
In Ubuntu the default archive opener “File Roller” can extract RAR files. There is a free command line version available for Linux also.
Installation:

sudo apt-get install unrar

Usage:

unrar x filename.rar

Usage with a password protected file:

unrar -p x filename.rar

OS X: Unrar X
http://www.unrarx.com/

Windows: 7-Zip
http://www.7-zip.org/