KPDF : Based on Xpdf, simple pdf viewer. It was in KDE 3 default.
http://kpdf.kde.org/

Okular : Default document viewer of KDE 4. Based on KPDF. Supported by a lot format.
http://okular.kde.org/

Foxit Reader : Foxit software’s non-commercial production.
http://www.foxitsoftware.com/pdf/reader/

Adobe Reader : Except viewing pdf, large scale and slow because of being used a lot of things different.

http://www.adobe.com/products/reader.html

PdfMod : Through that tool, you can add page from another document to pdf documents. You can also change title, writer, subject and keywords of the document.
http://live.gnome.org/PdfMod

Xpdf : PDF viewer and library. It can decode LZW and read encrypted pdf.
http://www.foolabs.com/xpdf/

xournal : This software can sketch, take notes on pdf documents.

http://xournal.sourceforge.net/

ePDFView: A lightweight pdf viewer.
http://trac.emma-soft.com/epdfview/

gPDFText : gPDFText is a text editor for GTK+ that opens PDF documents for ebook readers, converts the text contents into plain ASCII text, restores the original paragraphs and removes unwanted line breaks to allow easier zooming on the reader.
http://gpdftext.sourceforge.net/

PDF-Shuffler : It is used to divide, gather, crop and rearrange.
http://sourceforge.net/projects/pdfshuffler/

PDFedit : Complete editing of pdf documents is possible with PDFedit. You can change raw pdf objects (for advanced users) or use many gui functions. Functionality can be easily extended using a scripting language (ECMAScript)
http://pdfedit.petricek.net/en/index.html

 
http://gwibber.com/
Hotot : Popular microblogging client. Have a useful and nice gui.
Preview images
View geographic informations
Extensions support
http://hotot.org/

qwit : Cross-platform client for Twitter.
depends on Qt4 only
Kde native look
http-proxy support
twitpic support
URL shorteners support
http://code.google.com/p/qwit/

Turpial : Lightweight twitter client, written in python.
URL shorteners support
twitpic, yfrog etc. support
Low system resources consumption
User mute
http://turpial.org.ve/

 
gtweety : Interface language only czech. Development is stopped.

https://launchpad.net/~sliver17/+archive/gtweety

 
Pino :Pino is a simple and fast X11 client for twitter and identi.ca. It can perfectly integrate into your Gnome or XFCE desktop.
Hiding menu and panels
Default Gnome notifications of new tweets
Deleting your own tweets
Cache for userpics
Spell checking
URL shortening
http://pino-app.appspot.com/

 
Yasst : Cross platform twitter client.
Show or hide the tweet panel
Opens an internet feed tab, enter the URL of a web feed to populate
Multicolumn and tabs support
http://www.yasst.org/

pidgin plugin: pidgin-microblog, Pidgin-twitterstatus, Pidgin-identica-status.
http://developer.pidgin.im/wiki/ThirdPartyPlugins

 
Buzzbird : XUL based twitter client.
URL shorteners support
Menu to insert emoji in tweets
Conversation views
http://getbuzzbird.com/

 
Choqok :Choqok is a free/open source micro-blogging client for KDE.
Preview images from Twitpic, YFrog, img.ly, plixi, Twitgoo and TweetPhoto services.
Preview videos from YouTube and Vimeo services.
URL shortening
Flickr, ImageShack, Twitpic, Twitgoo, Mobypicture and Posterous photo uploading

http://choqok.gnufolks.org/

What’s new in Fedora 15 Alpha”
GNOME 3
LibreOffice
KDE 4.6
Xfce 4.8
RPM 4.9

Full announcement

Release Notes

Download

Debian 6.0 includes the KDE Plasma Desktop and Applications, the GNOME, Xfce, and LXDE desktop environments as well as all kinds of server applications. It also features compatibility with the FHS v2.3 and software developed for version 3.2 of the LSB.”

Read the full announced the released of Debian 6.0

Download: http://debian.org/distrib/

sudo gedit /etc/apt/sources.list

Add this line into the oppening file with command.

deb http://deb.torproject.org/torproject.org maverick main

If you use a different version, write it in maverick. (etc. jaunty,lucid,karmic)
Save the file and close. Run the following commands.

gpg –keyserver keys.gnupg.net –recv 886DDD89

gpg –export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | sudo apt-key add -

sudo apt-get update

sudo apt-get install tor tor-geoipdb

Polipo Settings For Tor
Polipo is web proxy software that is installed with tor.

sudo gedit /etc/polipo/config

Delete the file and enter the polipo setting for tor.
Restart polipo.

sudo /etc/init.d/polipo restart

Install the torbutton plugin and restart firefox.
Visit https://check.torproject.org/ for checking.

Pidgin Proxy Settings For Tor
Go to Preferences -> Network -> Proxy and enter these settings.
Proxy type: SOCKS 5
Host: 127.0.0.1
Port: 9050

BitTornado – 0.3.18

BitTornado uses average 30mb ram. It’s written with Python. Super seeding and web seeding were developed by BitTornado group. The torrent files which were newly added, open in separate windows. When the program has started each time, you must add torrent files again. Program doesn’t automatically add and doesn’t continue where it left off. While torrent were adding, you can’t choose the files which will download. However after the adding of torrent, you can do this procedure. You can give priority to the file which you choose(want).
http://bittornado.com/

Deluge – 1.2.0

Deluge which is written by PyGTK uses average 35 mb ram. Deluge has plugin support. Super(initial) seeding support will be done with libtorrent library’s 0.15 version. You can give priority to the file which you choose. You can give priority to any pieces of a file which was in torrent with pieces extension.
http://deluge-torrent.org/

KTorrent – 3.2.4

Ktorrent is a bittorrent client for KDE. You can use Ktorrent in other desktop environment. It’s distributed with GPL. It uses average 15 mb ram. Intended peer can kicked or banned. While torrent was adding, the files which you want to download, were selectable. You can give priority to files and torrents. In various conditions, you can give a warning with sound or writing or you can execute a command. For example, if you download torrent or you reach a specific share ratio, you can set as computer’s automatically shutdowning. Also you can specialize Ktorrent with extensions like search box, log viewer etc.
http://ktorrent.org/

qBittorrent – v2.1.3

qBittorrent has approxiametly 25 language support. qBittorrent is written with qt4 and c++. qBittorrent uses approxiametly 15 mb ram. There is a specializeable search box in qBittorrent. The search results can added directly to the downloading list. Intented peers can be banned, peers’ downloading and uploading speeds can be limited. You can choose undesired files and give priority to them.
http://qbittorrent.sourceforge.net/

vuze – 4.2.0.8

Vuze which’s name is Azureus, is written with java. Because vuze need jre, vuze uses more system resources than other clients. Vuze can shows detailed informations about peers, pieces, files etc. Vuze has plug in and super(initial) seeding support. You can share torrent files and chat on vuze with your friends. You can watch and share DVD and HD videos. You can directly send files to devices like iPhone. You can use vuze as a social platform. You can make commands and vote for files.
http://vuze.com/

Transmission – 1.75

Because of it’s written with c, transmission uses less cpu and ram than other clients. It uses approxiametly 10 mb ram. Transmission is fast and plain. It has simple gui. Gui can be changed by extensions. There are different versions which are written with gtk and qt. You can use gtk version for Gnome or a similar desktop environment. You can use qt version for kde or similar desktop environment. You can give priority to files and limit the speed.
http://transmissionbt.com/

BitStorm Lite – 0.2q

BitStorm Lite is a simple client. It hasn’t got a lot of features. It uses approxiametly 5 mb ram.
https://sourceforge.net/projects/bbom/

GNOME BitTorrent Downloader – 0.0.32

GNOME BitTorrent Downloader has a plain and simple gui. When the program started, it wants torrent files from you. Program doesn’t automatically continue where it left off. After you add the torrent file, if you choose a directory, it continues where it left off. Each torrents which were added, continues in different windows.
http://gnome-bt.sourceforge.net/

TopBT – 2.0

Because of TopBT is based on vuze, it needs jre. TopBT eveluates peers’ network proximities rates by using ping and nmap tools. It can decrease the traffic aproximately %25 rate. It shows the traffic which saved on status bar and some statistics. TopBT’s aim is increase unnecessary bittorrent traffic. Because, according to the IPOQUE’s report which was published in 2007, 40% of Internet traffic constitutes bittorrent traffic.
http://topbt.cse.ohio-state.edu/

FrostWire – 4.18.6

FrostWire is a file sharing program which has bittorrent support and uses Gnutella network. FrostWire is written with java. FrostWire has search box and media player.
http://frostwire.com/