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= Internet Applications =
Internet applications enable you to make full use of your Internet connection. Web browsers, Email clients, Instant Messengers, and more are included in this category.

== Web Browsers ==
=== Mozilla Firefox ===
[http://www.mozilla.com/en-US/ Mozilla Firefox] is the ubiquitous web browser. Based on open source components, it is trademarked and cannot be altered or re-distributed with any change that involves the name or trademarks.
Install the current version:
 sudo apt-get install firefox

==== Install Firefox 3.6 ====
Firefox 3.6 is not yet in the official Ubuntu repositories. Obtain from the Launchpad repositories and install:
 sudo add-apt-repository ppa:mozillateam/firefox-stable
 sudo apt-get update
 sudo apt-get install firefox-3.6 firefox-3.6-branding

Note: This method requires that port 11371 for the (repository) keyserver be open in your [[#Firewall|firewall]].

==== Firefox Plug-ins ====
===== Adblock plug-in (block ads in a web page) =====
[http://adblockplus.org/en/ Adblock Plus] blocks ads that appear in web pages. You can subscribe to a free filter service, and can add ads to block with a single click. 
 sudo apt-get install sudo apt-get install xul-ext-adblock-plus

*You can also add this extension from Firefox -> Tools -> Add-ons -> Get Add-ons -> Browse All Add-ons. (This method will also ensure that automatic updates are installed by Firefox.)

===== Noscript plug-in (controls scripts) =====
The [http://noscript.net/ Noscript] plugin is considered one of the most important security measures for browsing the Internet. Most viruses and trojans gain access to computers from the Internet through scripts. This plugin allows you to choose which scripts to allow and blocks the rest.
 sudo apt-get install mozilla-noscript

*You can also add this extension from Firefox -> Tools -> Add-ons -> Get Add-ons -> Browse All Add-ons. (This method will also ensure that automatic updates are installed by Firefox.)

===== User Agent Switcher plug-in for Firefox =====
The [http://chrispederick.com/work/user-agent-switcher/ User Agent Switcher] plugin allows a browser to masquerade as another browser, allowing (most of the time) browser-specific content to be displayed.

*You can add this extension from Firefox -> Tools -> Add-ons -> Get Add-ons -> Browse All Add-ons. (This method will also ensure that automatic updates are installed by Firefox.)

===== Video DownloadHelper plug-in for Firefox =====
The [https://addons.mozilla.org/en-US/firefox/addon/3006 Video Download Helper] plugin allows the download of videos (including Flash videos) from sites like YouTube.

*You can add this extension from Firefox -> Tools -> Add-ons -> Get Add-ons -> Browse All Add-ons. (This method will also ensure that automatic updates are installed by Firefox.)

===== Unplug Download Management =====
The [https://addons.mozilla.org/en-US/firefox/addon/2254 UnPlug] add-on lets you save video and audio which is embedded on a webpage.

*You can add this extension from Firefox -> Tools -> Add-ons -> Get Add-ons -> Browse All Add-ons. (This method will also ensure that automatic updates are installed by Firefox.)

===== Java Runtime Environment (JRE) for Firefox plug-in =====
This package also installs the Java Runtime Environment. (JRE is also installed when OpenOffice or [[#Restricted Extras|ubuntu-restricted-extras]] is installed.)
 sudo apt-get install sun-java6-jre sun-java6-plugin
Note: You must accept the license to use this product.

===== Adobe Acrobat Reader for Firefox Plug-in =====
This plugin is available from the Medibuntu repository. It allows you to view Adobe Acrobat files within the Firefox browser.
*Add the Medibuntu repository to your [[#Add_Repositories_using_Synaptic_Package_Manager|repository list]]:
:deb <nowiki>http://packages.medibuntu.org/</nowiki> lucid free non-free
*Install:
 sudo apt-get install acroread mozilla-acroread acroread-plugins acroread-fonts

===== Adobe Flash Player for Firefox Plug-in =====
To install the official Adobe Flash plugin (Flash 10) for Firefox:
 sudo apt-get install adobe-flashplugin

===== Gnash Plug-in (Open source Flash Player replacement) =====
[http://www.gnashdev.org/ Gnash] is available in a 64-bit version as well as a 32-bit version. It is the open source replacement for Adobe Flashplayer.
 sudo apt-get install gnash

After installing, change your web browser's Preferences -> Applications so that SWF and SPL files use Gnash.

===== VLC plug-in for Firefox =====
This package allows the popular VLC player to play media within the Firefox browser.
 sudo apt-get install mozilla-plugin-vlc

===== Gecko MediaPlayer Plug-in for Firefox =====
[http://kdekorte.googlepages.com/gecko-mediaplayer Gecko MediaPlayer] is a browser plugin for all Gecko-based browsers (Firefox, SeaMonkey, IceApe, Opera) that allows Mplayer to play multimedia within the browser. Install:
 sudo apt-get install gecko-mediaplayer

An alternative is to use the mplayer plugin for Firefox. Install:
  sudo apt-get install mozilla-mplayer

===== Kaffeine Plug-in for Firefox =====
This package allows the Kaffeine media player (often used in KDE-based desktops) to play multimedia within the Firefox browser.
 sudo apt-get install kaffeine-mozilla

===== Helix player plug-in for Firefox =====
This package installs the [https://helixcommunity.org/ Helix player] (the open source player that plays Real Player content in Linux) as well as the plugin that plays RealMedia within the Firefox browser.
 sudo apt-get install mozilla-helix-player

===== Moonlight plugin for Firefox =====
[http://www.go-mono.com/moonlight/ Moonlight] is part of the Novell Mono project that is an open source implementation of Silverlight (the Microsoft multimedia presentation platform). It is based on FFMpeg. It is made to work best with the Firefox 3 web browser, as a plugin (but also works with other mozilla browsers). Version 1 is available as a plugin for mozilla-based browsers:
 sudo apt-get install moonlight-plugin-mozilla

:Version 2 is available [http://www.go-mono.com/moonlight/download.aspx here]. The Moonlight 2.99 plugin (compatible with most Silverlight 3 content) [http://www.go-mono.com/moonlight/prerelease.aspx is here].

* Netflix under Moonlight
:Netflix streaming requires both the capabilities of Silverlight 2.0 and Digital Rights Management modules. Although the current version of Moonlight 2.0 will run most Silverlight content (including Netflix content), Netflix has not yet released Digital Rights Management modules for Linux. Please contact [http://www.netflix.com/ContactUs Netflix] directly for further information.

===== FireFTP for Firefox =====
[http://fireftp.mozdev.org/ FireFTP] is a Firefox extension for FTP transfers.

===== Firefox Widgets =====

==== Turn off browser bar drop-down list in Firefox ====
This is the most frequently asked problem regarding Firefox. To [http://kb.mozillazine.org/Browser.urlbar.maxRichResults turn off the location browser bar drop-down list] (and therefore not show your browsing history):
:Firefox -> about:config (in the location browser bar) -> browser.urlbar.maxRichResults -> ''right-click'' -> Modify -> set value to 0

=== IceCat ===
[http://en.wikipedia.org/wiki/GNU_IceCat IceCat] is Firefox distributed without the Mozilla trademark restrictions. It is endorsed by the Debian project (on which Ubuntu is based). It is formerly known as IceWeasel and is also known as IceApe Browser.
Install the current version:
 sudo apt-get install iceape-browser

=== SeaMonkey ===
[http://www.seamonkey-project.org/ SeaMonkey] is an open-source integrated internet application suite (including web browser, IM (IRC) client, Email client, RSS/News reader, and web development tools). It is based on the same components as the Mozilla products and shares the trademark and branding restrictions. There are many [https://addons.mozilla.org/en-US/seamonkey/ plugins], similar to those for Thunderbird and Firefox. Install:
 sudo apt-get install seamonkey

=== IceApe ===
[http://en.wikipedia.org/wiki/Naming_conflict_between_Debian_and_Mozilla IceApe] is an open-source integrated internet application suite (including web browser, IM (IRC) client, Email client, RSS/News reader, and web development tools). It is based on the same components as the Mozilla product SeaMonkey, but has no restrictive trademark licensing, and is endorsed by the Debian project (on which Ubuntu is based). 
Install the current version:
 sudo apt-get install iceape

=== Opera ===
[http://www.opera.com/ Opera] is a proprietary browser and internet suite (currently free on PCs) also used in some mobile devices and gaming consoles. It includes email, an address book, IRC chat, integrated BitTorrent, and webfeeds. A limited number of plugins are also available.
 sudo apt-get install opera

=== Chromium ===
[http://dev.chromium.org/ Chromium] is the open-source browser on which the Google Chrome browser is based. Install:

*Edit the source.list file:
 sudo gedit /etc/apt/sources.list
*Add these launchpad repositories to the source.list file.
 deb <nowiki>http://ppa.launchpad.net/chromium-daily/ppa/ubuntu</nowiki> lucid main
 deb-src <nowiki>http://ppa.launchpad.net/chromium-daily/ppa/ubuntu</nowiki> lucid main
*Add the GPG key (you must have port 11371 open in your firewall to use the keyserver):
 sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 0xfbef0d696de1c72ba5a835fe5a9bf3bb4e5e17b5
*Update the source list:
 sudo apt-get update
*Install Chromium:
 sudo apt-get install chromium-browser

*Start Chromium:
:Applications -> Internet -> Chromium Web Browser

=== Google Chrome ===
[http://www.google.com/chrome Google Chrome] is Google's web browser. Based on the [[#Chromium|Chromium]] browser, Google adds the Google name and logo, an auto-updater system called GoogleUpdate, RLZ, and other Google add-ons. Download and install it [http://www.google.com/chrome/eula.html here].

== Download Managers ==
=== Downloader for X ===
[http://en.wikipedia.org/wiki/Downloader_for_X Downloader for X] is a GTK-based free-standing download manager utility. Still included in current repositories, the project appears dead. It is open-source, but does not have a GPL license.
 sudo apt-get install d4x

== Email Clients ==
=== Evolution ===
[http://projects.gnome.org/evolution/ Evolution] is the default Gnome-based email client in Ubuntu. If not installed:
 sudo apt-get install evolution

==== Evolution and PGP ====
Email messages can be encrypted in [[#PGP_.28Message_Encryption.29|PGP]] and sent by email using Evolution. See [http://support.real-time.com/linux/email/client/evolutionpgp.html this tutorial] for an example how to configure it.

=== Thunderbird ===
[http://www.mozilla.com/en-US/thunderbird/ Mozilla Thunderbird] is a licensed and trademarked free open-source email client that is compatible with Firefox. Install:
 sudo apt-get install thunderbird

==== Lightning calendar extension ====
[http://www.mozilla.org/projects/calendar/lightning/ Lightning] is the calendar extension for Thunderbird (with functionality similar to the stand-alone application Sunbird). Install:
 sudo apt-get install lightning-extension

==== Enigmail ====
[https://addons.mozilla.org/en-US/thunderbird/addon/71 Enigmail] is an add-on to Thunderbird that allows you to easily encrypt your email using [http://en.wikipedia.org/wiki/Pretty_Good_Privacy OpenPGP], which is included in the kernel by default. It also allows you to create and manage the encryption keys. Install:
 sudo apt-get install enigmail

==== New Mail Icon for Thunderbird ====
[https://addons.mozilla.org/en-US/thunderbird/search?q=new+mail+icon&cat=all "New Mail Icon"] is an experimental tray add-on which notifes you of new mail. Download from the website. Install: 
:Thunderbird -> Tools -> Add-ons -> Install -> select downloaded file

=== KMail ===
[http://kontact.kde.org/kmail/ KMail] (Kontact Mail) is the default email client included with [[#Kontact Personal Information Manager|Kontact]] in KDE (Kubuntu). Kontact includes email, an address book, a calendar, reminders, pop-up notes, a link to the Akregator News/RSS reader, time-tracking, and more. Install:
 sudo apt-get install kontact

== Newsreaders ==
=== Akregator ===
[http://akregator.kde.org/ Akregator] is the default news/[http://en.wikipedia.org/wiki/RSS RSS] reader included with Kubuntu (KDE). Usage instructions are found in the [http://akregator.kde.org/wiki/index.php/Handbook Handbook]. Install:
 sudo apt-get install akregator

=== RSSOwl ===
[http://www.rssowl.org/ RSSOwl] is a Java-based [http://en.wikipedia.org/wiki/RSS RSS] | RDF | Atom Newsfeed Reader.

Install java and in order to use the internal browser, install the packages xulrunner and firefox:
 sudo apt-get install sun-java6-jre firefox xulrunner

Change to your "opt" directory:
 cd /opt

Download the zip-archive into your opt directory:
 sudo wget <nowiki>http://downloads.sourceforge.net/rssowl/rssowl-2.0.4.linux.zip</nowiki>

Extract the archive and remove the extracted file:
 sudo unzip ./rssowl-2.0.4.linux.zip && sudo rm ./rssowl-2.0.4.linux.zip

Make a startscript:
 sudo gedit /usr/bin/runRSSOwl.sh

add the following lines to your startscript file /usr/bin/runRSSOwl.sh and save it afterwards.

     #!/bin/bash
     cd /opt/rssowl
     ./RSSOwl

Make the startscript executable:
 sudo chmod u+x /usr/bin/runRSSOwl.sh

To start RSSOwl:
 runRSSOwl.sh

== Instant Messengers ==
=== Empathy ===
[http://live.gnome.org/Empathy Empathy] is an open source IM application. It is the default in the Ubuntu (Gnome) desktop. You can access multiple services with it. If not already installed, you can install it:
 sudo apt-get install empathy

=== Pidgin ===
[http://www.pidgin.im/ Pidgin] is an open source IM application. It is the previous default in the Ubuntu (Gnome) desktop. You can access multiple services with it.
 sudo apt-get install pidgin

=== Kopete ===
[http://kopete.kde.org/ Kopete] is the default Instant Messenger application for Kubuntu. You can access multiple services with it. Install:
 sudo apt-get install kopete

==== Kopete Styles ====
Additional [http://www.kde-look.org/index.php?xcontentmode=24x26 styles for Kopete] are available from KDE-look. Install from:
::Kopete -> Settings -> Configure -> Chat Window -> Style -> Get New...  

==== GoogleTalk on Kopete ====
[[#Kopete|Kopete]] can be configured to work with [http://www.google.com/talk/about.html GoogleTalk] Instant Messaging (but not VOIP) using the Jabber protocol.
See these [http://www.google.com/support/talk/bin/answer.py?answer=57557 GoogleTalk instructions].

=== Konversation (IRC client) ===
[http://konversation.kde.org/ Konversation] is the default Kubuntu Internet Relay Chat (IRC) client. It functions similar to the venerable mIRC. "A little less action and a little more Konversation." -- Elves Install:
 sudo apt-get install konversation

=== aMSN ===
aMSN is an MSN Messenger utility that functions like the original client. It is alternative to [[#Pidgin|Pidgin]] for MSN users. Install it:
 sudo apt-get install amsn

To enable Drag-and-Drop capabilities to aMSN for easy file transfer see [http://www.ubuntugeek.com/how-to-enable-drag-and-drop-capabilities-to-amsn.html Ubuntu Geek].

=== Emesene ===
[http://www.emesene.org/ Emesene] is an MSN messenger client that uses a simplified interface similar to the original client. It is alternative to [[#Pidgin|Pidgin]] for MSN users. Install it:
 sudo apt-get install emesene

== FTP Clients ==
You might wish to use a dedicated [http://en.wikipedia.org/wiki/File_Transfer_Protocol FTP] client instead of the one in your browser.
=== Filezilla ===
[http://filezilla-project.org/ Filezilla] is the ubiquitous free open-source FTP client and server for all platforms.
 sudo apt-get install filezilla

== Filesharing / P2P ==
Do not share copyrighted material or content that is otherwise illegal to share.

=== Transmission (BitTorrent Client) ===
Transmission is the GTK-based default [http://en.wikipedia.org/wiki/BitTorrent_(protocol) BitTorrent] client in Ubuntu (Gnome).
 sudo apt-get install transmission

=== KTorrent ===
[http://ktorrent.org/ KTorrent] is the default BitTorrent client in Kubuntu. Install:
 sudo apt-get install ktorrent

Be sure to have your firewall ports open (by default 6881 and 4444).

=== Azureus ===
[http://azureus.sourceforge.net/howto_linux.php Azureus] is a Java-based BitTorrent client.
 sudo apt-get install azureus

=== QTorrent ===
QTorrent is a PyQT-based BitTorrent Client that is supposed to be very fast.
 
[http://thegraveyard.org/qtorrent.php QTorrent]

=== Apollon (P2P Filesharing) ===
[http://apollon.sourceforge.net/index.html Apollon] is an older BitTorrent client oriented towards KDE. It uses plugins for compatibility with multiple networks.
 sudo apt-get install apollon gift

=== MLDonkey (P2P eMule/eDonkey2000) ===
MLDonkey is a P2P file sharing program (and network) that is able to use different network protocols. To install the MLDonkey core server, follow [https://help.ubuntu.com/community/MLDonkey these instructions].

==== MLDonkey GUI frontends ====
*Install the Gnome GUI frontend for MLDonkey:
 sudo apt-get install mldonkey-gui
*Another GUI is called [http://sancho.awardspace.com/ Sancho].
*[http://extragear.kde.org/apps/kmldonkey/ KMLDonkey] is the KDE (Kubuntu) frontend  for [http://mldonkey.sourceforge.net/Main_Page MLDonkey].
 sudo apt-get install kmldonkey