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Linux Kernel 2.6
[3019 users on Ohloh]
Linux is a free software kernel, which combined with the GNU libraries, core utils and shell form the GNU/Linux operating system.
[2626 users on Ohloh]
Bash is an sh-compatible command language interpreter that executes commands read from the standard input or from a file. Bash also incorporates useful features from the Korn and C shells (ksh and csh).

Bash is ultimately intended to be a conformant implementation of the IEEE POSIX Shell and Tools specification (IEEE Working Group 1003.2).

[2014 users on Ohloh]
GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plu...

[1959 users on Ohloh]
Vim is an advanced text editor that seeks to provide the power of the de-facto Unix editor 'Vi', with a more complete feature set. It's useful whether you're already using vi or using a different editor.
[1790 users on Ohloh]
Grep searches one or more input files for lines containing a match to a specified pattern. By default, grep prints the matching lines.
[1597 users on Ohloh]
X.Org provides an open source implementation of the network-transparent X Window System, as well as working on the standard itself.

The development work is being done as part of the freedesktop.org community, sponsored by the X.Org Foundation.

GNU Core Utilities
[1286 users on Ohloh]
The GNU Core Utilities are the basic file, shell and text manipulation utilities of the GNU Operating System.
[1149 users on Ohloh]
The GNOME project provides two things: The GNOME desktop environment, an intuitive and attractive desktop for users, and the GNOME development platform, an extensive framework for building applications that integrate into the rest of the desktop.
[991 users on Ohloh]
rsync is an open source utility that provides fast incremental file transfer.
Debian GNU/Linux
[981 users on Ohloh]
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian uses the Linux kernel (the core of an operating system), but most of the basic OS tools come from the GNU project; hence the name GNU/Linux.
GNU findutils
[852 users on Ohloh]
GNU findutils includes find, xargs, locate and updatedb. These tools proivide ways to search for files on your system by specifying what kind of file you're looking for.
[680 users on Ohloh]
The K Desktop Environment (KDE) is a graphical desktop, a set of applications and a development platform. It is created by a community of people dedicated to create a free and user-friendly computing experience. KDE offers all necessary means to easily build all kinds of applications upon.

KDE has been around since 1996, with code change history dating back at least to 1997.

KDE is one of the biggest free software C++ project around and one of the two leaders of unix desktops.

GNU sed
[659 users on Ohloh]
Sed (streams editor) isn't really a true text editor or text processor. Instead, it is used to filter text, i.e., it takes text input and performs some operation (or set of operations) on it and outputs the modified text.

Sed is typically used for extracting part of a file using pattern matching or substituting multiple occurrences of a string within a file.

Common Unix Printing System (CUPS)
[634 users on Ohloh]
CUPS provides a portable printing layer for Unix(r)-based operating systems. It has been developed to promote a standard printing solution for all Unix vendors and users. CUPS provides the System V and Berkeley command line interfaces, and uses the Internet Printing Protocol ("IPP") as the basis for managing print jobs and queues. The Line Printer Daemon (LPD) Server Message Block (SMB), and AppSocket (a.k.a. JetDirect) protocols are also supported with reduced functionality. CUPS adds network p...
[587 users on Ohloh]
Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.

(Wireshark was known as Ethereal until June 09, 2006)

GNU Emacs
[572 users on Ohloh]
Emacs is the extensible, customizable, self-documenting real-time display editor.
[542 users on Ohloh]
Rediscover Your Music!

Amarok is the music player for Linux and Unix with an intuitive interface. Amarok makes playing the music you love easier than ever before - and looks good doing it.

[530 users on Ohloh]
Wine is an implementation of the Windows API on top of X and Unix. It does not require Microsoft Windows, but can use native Windows DLLs if they are available. It provides both a development toolkit for porting Windows source code to Unix as well as a program loader, allowing many unmodified Windows programs to run on x86-based Unixes.
GNU C Library
[426 users on Ohloh]
The GNU C Library, glibc, provides the standard C library interface for GNU/Linux and other Free Software operating systems.
[351 users on Ohloh]
Cygwin is a Linux-like environment for Windows.
It consists of an emulation DLL providing Linux API functionality, and ports of thousands of Linux tools to Windows.