GPL-2.0-or-later — independent software & tools
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dbcsr
Distributed Block Compressed Sparse Row matrix library
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dcfldd
Enhanced version of dd for forensics and security
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dcraw
Digital camera RAW photo decoding software
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ddclient
Update dynamic DNS entries
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ddcutil
Control monitor settings using DDC/CI and USB
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ddrescue
GNU data recovery tool
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debianutils
Miscellaneous utilities specific to Debian
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desktop-file-utils
Command-line utilities for working with desktop entries
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dfu-programmer
Device firmware update based USB programmer for Atmel chips
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dfu-util
USB programmer
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dhex
Ncurses based advanced hex editor featuring diff mode and more
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dict
Dictionary Server Protocol (RFC2229) client
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diff-pdf
Visually compare two PDF files
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digitemp
Read temperature sensors in a 1-Wire net
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dislocker
FUSE driver to read/write Windows' BitLocker-ed volumes
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distcc
Distributed compiler client and server
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djview4
Viewer for the DjVu image format
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djvulibre
DjVu viewer
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dns2tcp
TCP over DNS tunnel
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dnsviz
Tools for analyzing and visualizing DNS and DNSSEC behavior
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dopewars
Free rewrite of a game originally based on "Drug Wars"
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dosbox-staging
Modernized DOSBox soft-fork
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dosbox-x
DOSBox with accurate emulation and wide testing
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doublecpp
Double dispatch in C++
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doxymacs
Elisp package for using doxygen under Emacs
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dpkg
Debian package management system
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dsh
Dancer's shell, or distributed shell
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dspdfviewer
Dual-Screen PDF Viewer for latex-beamer
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dtach
Emulates the detach feature of screen
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dump1090-fa
FlightAware ADS-B Ground Station System for SDRs
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duo_unix
Two-factor authentication for SSH
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duplicity
Bandwidth-efficient encrypted backup
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dvd-vr
Utility to identify and extract recordings from DVD-VR files
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dvdauthor
DVD-authoring toolset
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dvdrtools
Fork of cdrtools DVD writer support
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dwarf
Object file manipulation tool
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dwatch
Watch programs and perform actions based on a configuration file
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dxflib
C++ library for parsing DXF files
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easy-tag
Application for viewing and editing audio file tags
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ebook2cw
Converts ebooks to morse code
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ecasound
Multitrack-capable audio recorder and effect processor
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edbrowse
Command-line editor and web browser
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eg
Expert Guide. Norton Guide Reader For GNU/Linux
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ejabberd
XMPP application server
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enigma
Puzzle game inspired by Oxyd and Rock'n'Roll
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erofs-utils
Utilities for Enhanced Read-Only File System
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esptool
ESP8266 and ESP32 serial bootloader utility
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ettercap
Multipurpose sniffer/interceptor/logger for switched LAN
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evince
GNOME document viewer
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execstack
Utility to set/clear/query executable stack bit
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exiftran
Transform digital camera jpegs and their EXIF data
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exim
Complete replacement for sendmail
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exiv2
EXIF and IPTC metadata manipulation library and tools
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exploitdb
Database of public exploits and corresponding vulnerable software
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ext2fuse
Compact implementation of ext2 file system using FUSE
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exult
Recreation of Ultima 7
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fail2ban
Scan log files and ban IPs showing malicious signs
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fastjar
Implementation of Sun's jar tool
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fatsort
Sorts FAT16 and FAT32 partitions
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faust
Functional programming language for real time signal processing