amsn: alternative for MSN Messenger

gaim: alternative for Aim, ICQ, IRC, Yahoo!, MSN, Jabber (Google Talk)

irssi: (command line based) alternative for mIRC

kopete: alternative for Aim, ICQ, IRC, Yahoo!, MSN, Jabber

licq: alternative for ICQ

psi: jabber client

xchat: альтернатива mIRC

KVIrc : альтернатива mIRC

konversation: alternative for mIRC

Skype: Skype has also version in Linux

WengoPhone:Wengophone also has a Linux version and is open source

SIM-IM: alternative for ICQ, Jabber, MSN, SMS, Yahoo!, AIM

krusader: alternative for Total Commander

GNOME Commander

gFTP: alternative for FileZilla, SmartFTP

digiKam: alternative for the propriotary digital photo software bundled with your camera

gimp: alternative for Adobe Photoshop

Inkscape : alternative for Adobe Illustrator

gqview: alternative for Irfanview

gwenview : alternative for Irfanview

kuickshow: alternative for Irfanview

Konqueror: alternative for Internet Explorer

Mozilla Firefox: there is no alternative!

Seamonkey (previously called Mozilla): alternative for Internet Explorer

Opera: free but proprietary alternative for Internet Explorer

Evolution: alternative for Outlook

Mozilla Thunderbird: alternative for Outlook Express

Kontact / kmail: alternative for Outlook Express

AmaroK: alternative for iTunes player/WMP

XMMS: alternative for WinAMP http://komnas.com/~ashamril/tips/files/win-vs-lin-soft-EN.shtml

beep-media-player: alternative for WinAMP

kaffeine: alternative for Windows Media Player (also plays DVDs)

MPlayer | gmplayer | kmplayer | kplayer: alternative for Windows Media Player

Xine: alternative for Windows Media Player (also plays DVDs)

vlc: alternative for Windows Media Player

RealPlayer: runs natively on linux!

Totem : alternative for WMP, Menusupport for DVDs

LMMS : "Linux Music Maker Studio" Linux analog of "FL Studio" HomePage:http://www.lmms.sourceforge.net/

Rosegarden : MIDI/Audio-sequencer HomePage:http://www.rosegardenmusic.com/

Cheese-Tracker : one of the Trackers, use QT

OpenOffice.org: alternative for MS Word, Excel, Powerpoint and Access, great support for MS formats

KOffice : like above without MS format support. Includes more specialized apps than even the full MS Office Pro

AbiWord : Only like MS Word. Decent MS Format support. Includes grammar check

StarOffice: commercial version of OpenOffice.org, includes extras (grammar check)

kpdf, xpdf, epdfview, evince: PDF readers, alternative for Adobe Acrobat Reader

Azureus: java bittorrent client (or bittorrent which is written in python)

qtorrent, ktorrent: bittorrent clients

Limewire + gtk-gnutella: Gnutella client

MLDonkey + Sancho: client and interface for bittorrent, Gnutella, FastTrack, etc.

aMule: alternative for eMule

xmule: alternative for eMule

nicotine: soulseek client

Valknut, LinuxDC++ : альтернативные клиенты для DC (Direct Connect)