Open-Source Software (OSS) is computer software with its source code made available and licensed with a license in which the copyright holder provides the rights to study, change and distribute the software to anyone and for any purpose. Open-source software is very often developed in a public, collaborative manner. Open-source software is the most prominent example of open-source development and often compared to user-generated content or open-content movements.
1. Desktop Distribution
Arch
Bodhi
Chakra
CrunchBang
Debian
Fedora
Fuduntu
Gentoo
Linux Mint
Mageia
Mandriva
Manjaro
MEPIS
openSuse
PClinuxOS
Puppy
Sabayon
Salix
Slackware
SolusOS
SparkyLinux
SUSE Linux
Ubuntu
VectorLinux
Zorin OS
2. Browser
Chrome
Chromium
Conkeror
Dillo
dwb
Epiphany
Firefox
Konqueror
links/elinks
Luakit
lynx
Midori
Opera
QupZilla
rekonq
SeaMonkey
SlimBoat
Uzbl
w3m
3. Open Source Web Framework
Apache Wicket
CakePHP
Cappuccino
CodeIgniter
Django
Express
Flask
Grails
Pyramid
Ruby on Rails
Sinatra
Spring
Struts
Symfony
web2py
Yii
Zend Framework
mojolicious
Laravel
4. IDE/Web Development Editor
Anjuta
Aptana Studio
Bluefish
Code::Blocks
Eclipse
Emacs
eric
Geany
IDLE
Kdevelop
Komodo
Kompozer
Lazarus
Leo
MonoDevelop
Netbeans
Qt Creator
Quanta
Quanta Plus
SeaMonkey Composer
Zend Studio
5. Audio Media Player Application
amaroK
Aqualung
aTunes
Audacious
Banshee
Clementine
cmus
DeaDBeef
Exaile
gmusicbrowser
MOC
MPD
mpg123
mpg321
Nightingale
Pogo
Quod Libet
RhythmBox
Sonata
VLC
XMMS
XMMS2
6. Video Media Player Application
Dragon Player
DVD-Player (XBMC)
FFplay
kaffeine
Miro
mplayer
mplayer2
Parole
Totem
VLC
xine
7. X Terminal Emulator
aterm
Eterm
GNOME Terminal
gtkterm
Guake
Konsole
Kuake
LilyTerm
LXTerminal
Roxterm
rxvt
Sakura
stjerm-terminal
Terminal (Xfce)
Terminator
Tilda
urxvt
xterm
Yakuake
Terminology
Termit
8. Mobile Distribution
Android
Chrome OS
CyanogenMod
Firefox OS
MeeGo
Mer
Replicant
Sailfish OS
Tizen
Ubuntu Phone
webOS
9. Programming Language
Ada
Assembly
AWK
C
C#
C++
Clojure
COBOL
Common Lisp
Erlang
Fortran
Free Pascal
Go
Haskell
Java
Javascript
Lua
Objective-C
Perl
PHP
Python
R
Ruby
Scala
Scheme
Tcl
10. Text Editor
Emacs
Geany
gedit
jEdit
joe
Kate
KWrite
leafpad
medit
Midnight Commander Editor
Mousepad
nano
Nedit
pico
RedCar
Scite
Scribes
vi
vim
11. Desktop Environment
Cinnamon
Gnome Shell
KDE
LXDE
MATE
Razor-qt
rox
Trinity-DE
Unity
Xfce
12. Virtualization Product
KVM
Linux-VServer
OpenVZ
Oracle VM
Parallels Workstation
QEMU
VirtualBox
VMware
Xen
LXC
13. File Manager
Caja
Dolphin
Double Commander
emelFM2
gentoo
Gnome Commander
Konqueror
Krusader
Midnight Commander
muCommander
Nautilus
Nemo
PCManFM
ranger
ROX-Filer
SpaceFM
Thunar
vifm
Worker
Xfe
14. Backup Application
AMANDA
Areca-Backup
Back In Time
BackupPC
Bacula
Clonezilla
cpio
Deja Dup
dump
Duplicity
FSArchiver
G4L
luckyBackup
partimage
rdiff-backup
Redo Backup and Recovery
rsnapshot
rsync
tar
Time Vault
Burp
15. Network Monitoring Application
Big Brother
Ganglia
GroundWork Monitor
Icinga
mon
monit
munin
Nagios Core
Nagios XI
NetXMS
OpenNMS
OpenQRM
Opsview
Shinken
Zabbix
Zenoss
16. Network Security Application
aircrack-ng
Bro IDS
ClamAV
dsniff
fail2ban
Firestarter
fwBuilder
Guarddog
kismet
Metasploit
Nessus
Nikto
Nmap Security Scanner
OpenVAS
p0f
Shorewall
snort
tcpdump
UFW/Gufw
Wireshark
17. Server Distribution
CentOS
Debian
Gentoo
Mandriva Enterprise Server
Oracle Enterprise Linux
Red Hat Enterprise Linux
Scientific Linux
Slackware
SUSE Linux Enterprise Server
Ubuntu LTS
18. Office Suite
Calligra
LibreOffice
OpenOffice.org
19. Window Manager
awesome
Compiz
dwm
Enlightenment
Fluxbox
FVWM
i3
IceWM
JWM
KWin
Marco
MetaCity
Mutter
Openbox
Ratpoison
Sawfish
spectrwm
Window Maker
wmii
xfwm4
xmonad
Notion
twm
20. Graphics Application
Art of Illusion
Blender
CinePaint
Darktable
GIMP
ImageMagick
Inkscape
Kolourpaint
Krita
LazPaint
LightZone
mtPaint
MyPaint
Pinta
RawTherapee
Scribus
Tux Paint
GrafX2
G'MIC
21. Open Source Game
0 A.D.
Armagetron Advanced
AssaultCube
Battle for Wesnoth
BZFlag
FlightGear
Freeciv
Frets On Fire
Frozen Bubble
GNU Chess
LBreakout2
MegaGlest
Minetest
NetHack
Neverball
Open Arena
OpenClonk
OpenTTD
Pingus
Pioneer
PokerTH
Red Eclipse
StepMania
SuperTux
SuperTuxKart
The Mana World
TORCS
Trigger Rally
Tux Racer
UFO: Alien Invasion
Ur Quan Masters
Warzone 2100
World of Padman
Xonotic
FreeOrion
22. Privacy Solution
Adblock Plus
Disconnect
Ghostery
GnuPG
NoScript
Privoxy
Tor Browser Bundle
TrueCrypt
LastPass
HTTPS Everywhere
PasswordMaker
DoNotTrackMe
23. Open Source CMS/Blogging platform
Alfresco
b2evolution
CMS Made Simple
Dotclear
DotNetNuke
Drupal
eZ Publish
Joomla!
MODx
Movable Type
Octopress
Plone
Roller
Serendipity
SilverStripe
Textpattern
TYPO3
WordPress
XOOPS
Ghost
24. VoIP Application
Blink Qt
Ekiga
Empathy
Jitsi
KPhone
Linphone
Mangler
Mumble
opensoftphone
QuteCom
SFLphone
Skype
TeamSpeak
Twinkle
25. Database
DB2
Drizzle
EnterpriseDB
Firebird
MariaDB
MySQL
Oracle
Percona
PostgreSQL
sqlite
26. Revision Control System
Bazaar
BitKeeper
CVS
Fossil
git
Mercurial
Perforce
Subversion
27. Messaging Application
aMSN
BitlBee
CenterIM
EKG2
Empathy
Finch
Gajim
Gwibber
Gyachi
Irssi
Jitsi
Kadu
KDE-Telepathy
KMess
konversation
Kopete
Pidgin
Psi
qutIM
WeeChat
XChat
Hexchat
28. Configuration Management Tool
Bcfg2
cdist
Cfengine
Chef
Puppet
Salt stack
Spacewalk
Ansible
29. Host Security Application
AIDE
AppArmor
Bastille
chkrootkit
grsecurity
Lynis
Osiris
OSSEC
Rootkit Hunter
Samhain
SELinux
TOMOYO
Tripwire
30. NoSQL Database
Cassandra
CouchDB
HBase
Hypertable
Membase Server
MongoDB
Redis
Riak
Voldemort
Neo4j
Couchbase
Ref:- http://www.linuxquestions.org
