Radius Servers

Freeradius
Cistron
Dtc
GNUradius
Radiator
Openradius

Weblog analizers

Analog
Webalizer
Awstats
Lire
Logminer
Yaalr
WebDruid
Logrep
PhpMyVisites

Load balanced and High-Availability services

Ultramonkey
Pound
Linux-ha
Drbd

Websites counter

WWWcounter
Phpcounter

Online IP Subnet calculator

Subnet-Calculator
Subnet
Subnetmask

Linux Data Recovery Tools

Linuxrecovery
Testdisk
SystemrescueCD
KnoppixliveCD
dvdisaster
Stellar
Mondo Rescue
mkCDrec
ReaR

Change log Management

Elog
Change Control Request Manager
Brage-CM

Inventory and Help desk software’s

Helpdeskreloaded
F2w
Phphelpdesk
Helpmeict
Networkmanagementcenter
Freehelpdesksoftware
H-inventory
Assettracker
Irm
Cowtacular

partition software

Parted
Partlogic
Sformat

Firewalls

Bgsec
Netprotect
Fiaif
TurtleFirewall
Shorewall
Efw
Lutelwall
IPcop
Smoothwall
M0n0
Gibraltar

CD Burning software

DVDtools
Bashburn
Bbb
K3b
CDbakeoven
Burgner

Database Servers

Mysql
Postgresql
Sqlite
BerkeleyDB
Firebird
Picosql
Hsqldb
GNUsql
DB4o
Ingres
GT.M

Office Software Suites

Gnome Office
KOffice
OpenOffice
Siag Office
SOT Office

Concurrent Versioning System (CVS) server

CVS
DCVS
CVSNT
LysCVS

Concurrent Versioning System (CVS) Client

CVS Web Client
SandWeb
gCVS
LinCVS
cvsweb
Cervisia
cvsphpview

Router Management

jRouter
Telconi

File managers

emelFM
emelFM2
Konqueror
Krusader
Midnight Commander
Nautilus
Rox-Filer

Content management system(CMS)

Geeklog
Metadot Portal Server
MODx
myPHPNuke
PHP-Nuke
phpWebSite
Scoop
SPIP
Typo3
WebGUI
Xaraya
Drupal
Xoops

Portal Server

JBoss Portal Server 
Jetspeed 2 Portal Server
Joomla
Liferay
Metadot Portal Server
PHP-Nuke
PostNuke
Rainbow Portal
uPortal

Media players

AmaroK
Beep Media Player 
CoolPlayer
Kaffeine
Media Player Classic
MPlayer
musikCube
SkiTunes
Totem
VLC media player
Xine
XMMS
Zinf

Remote access

FreeNX
GenControl
Synergy
VNC
Karoshi
OCS Inventory NG

Operating systems

DragonFly BSD
FreeBSD
NetBSD
OpenBSD
Contiki
ECos
GNU
Haiku
Inferno
Linux
List of Linux distributions
NewOS
OpenSolaris
Plan 9 from Bell Labs
ReactOS
Syllable
Sunsolaris

Mailing List Managers 

Mailman
Mailing List
jclement
mlmmj
PHPMyList
Dada Mail
Majordomo
Minimalist
ezmlm-idx

CAD

freeCAD
JCad
QCad
BRL-CAD
VariCAD
CADSM
FREEdraft
Engy CAD
CYCAS

Webmail

SquirrelMail
WebMail
Personal Python
Simple Webmail
Null Webmail
oMail-Webmail
Decimail Webmail
PixMail 
Dolda Webmail
Open WebMail
PHlyMail

Email Client

Ascension Email
My Mail Client
Kmail
Mahogany Mail
Mozilla Thunderbird
Mutt 
Novell Evolution
Phoenix Mail
Sylpheed

Download Manager

Download Manager
Mtdownload
Konan
GDownloader
PHP Download Manager
Claros Downloader
UrlGfe
KMAGO
QuickDownloader

Personal information managers

Chandler
KAddressBook
GNOME-PIM
yq
PackRat
My Personal Home Page
XNotesPlus
Booby

Fax Related

HylaFax
Efax
Kphonecenter
efax

Video/audio conference

GnomeMeeting
vat/vic/wb
rat/wbd/nte
NeVoT
IVS

Instant Messaging

Licq
Centericq
Alicq
Micq
Gaim
Ayttm
Kopete
Everybuddy
Simple Instant Messenger
Ickle
aMSN
Kicq

Sharing data/files

NFS
Samba
Samba-TNG

Memory testing

Memtest86
memtest
Rumt
Memwatch
Memcheck

Finance

GnuCash
Grisbi
JMoney
KMyMoney
PayThyme 
QuantLib 
QuotesViewer
SQL Ledger
TurboCASH
phpfin
jgnash

Real Estate Management

REMS
Abitare
Realty Manager
Open-Realty

Blogs

Nucleus
pLog
Serendipity
phpBB Blog
BLOG:CMS
blur6ex
pppBLOG
PolkaDot Blog

Guestbook

Advanced Guestbook
guestbook
mySQL-Guestbook
FG Guestbook
Big Sam
Achims Guestbook
phpGB
Simple Posting System
KISGB

2D Animation

F4L
KToon
Synfig Studio

3D Animation

3DLDF
Aqsis
ArtofIllusion
K-3D
Blender

Image galleries

Album shaper
Camera Life
Coppermine Gallery
Gallery
Open Clip Art Library
KIG
MIG
DivePix
TFT Gallery

Virtual Private Servers

User Mode Linux (UML)
Xen
Linux-VServer
Qemu
Plex86
Bochs
FreeVPS

Data mining

Weka
YALE
bang
Weka-Parallel
Ferda Data Miner
Content-Based Cross-Site Web Data Mining

Dental Software

LinuDent
OdontoLinux!
Open Dental Software

FAQ Management and Generators

phpMyFAQ
FAQ-U
FAQ PLAIN
Faq-O-Matic
FAQ-Pool
Self Serve FAQ
@1 FAQ Publisher
phpFAQ
FAQtor
FAQman
ODFaq
FaqMaker
StandardFAQ
KnowledgebasePublisher

Multimedia codecs,containers and splitters

FLAC 
LAME 
Matroska
Musepack
Ogg Vorbis 
Xvid 
MP3 Splitter
splitmastream

Management Information Systems (MIS)

FreeMIS
Schooltool
Centre
Class
MRBS

Video Surveillance

Net-Cam
eLViS
Devolution Security
motion
Zoneminder

Geographic information system

GRASS GIS
gvSIG
JUMP
NASA World Wind
OpenMap 
Quantum GIS
TerraLib
uDig

Accounting Software

CTB
Tiny Accounting
XIWA
OBA
SQL-Ledger Accounting
PHPBalanceSheet
Muhasebeci
AccWhizz
Fruity Banking!
phpRechnung

Foreign Language Learning Software

Klang
VocableTrainerX
Flare
Pere
Vocabulary Trainer
Nihon-go Flash
JLearner

Project Management

Incyte Project Manager
Project Manager
phpEasyProject
Complex Project Manager
ProjectButler
ProjectBench
Sigma Six

Movie Editors

Open Movie Editor
medi8
Jubler
Kino
Gazelle Movie Editor
Subtitle Processor

Cluster Software

CDS Cluster 
openMosix
YACI
Ka Clustering toolkit
EZHA
Beowulf
Debian Cluster Components 
MOSIX Cluster

Timesheet Software

Timesheet.php 
Horde Hermes 
Ultrize TimeSheet
A Simple TimeSheet 
TTraq 
Multiple Time Sheets

Code generators

Bison
CodeWorker
Flex lexical analyser
Kodos
phpCodeGenie
Ragel State Machine Compiler
Redet
PHP Code Builder

Nutrition software 

nut
Diet Monger Ass Kicker
CRON-O-Meter

RPM Management

PyRPM
OPRPM
APT-RPM
RPMAutoUpdate
GnoRPM
easyRPM
kRPM

Library Management

Elidune
Nalanda
Koha
PhpMyLibrary
Media Library
Books
Library Manager
Campus-wide Library Access System

Desktop environments

GNOME
KDE
GNUstep
ROX Desktop
Xfce
EDE
Tango Desktop Project

Windowing systems

X Window System
X.Org Server
XFree86
XGGI 
Fresco
Xgl
Y Window System