I found this interesting list at this random forum on Internet and I found it worth sharing. It is indeed a huge list of free available software that you can use instead of buying or pirating the expensive ones. The list goes as following:

3D Graphics:

3Delight Free –
Anim8or – http://www.anim8or.com/
Aqsis – http://www.aqsis.com/
Blender – http://www.blender3d.org/
Houdini (Free Edition) – http://www.sidefx.com/apprentice/index.html
Now3D – http://digilander.libero.it/giulios/Eng/homepage.htm
OpenFX – http://www.openfx.org
POV-Ray – http://www.povray.org/
SOFTIMAGE|XSI EXP – http://www.softimage.com/products/exp/v3/
Terragen – http://www.planetside.co.uk/terragen/
Toxic – http://www.toxicengine.org/
Wings 3D – http://www.wings3d.com/

Anti-Virus:

a-squared –
AntiVir – http://www.free-av.com/
Avast –
AVG –
BitDefender – http://www.bitdefender.com
ClamWin – http://www.clamwin.com/

Anti Spyware:

Ad-aware – http://www.lavasoft.de/software/adaware/
Bazooka – http://www.kephyr.com/spywarescanner/index.html
Hijackthis – http://www.spywareinfo.com/~merijn/downloads.html
SpyBot Search & Destroy – http://spybot.safer-networking.de/
SpywareBlaster – http://www.javacoolsoftware.com/spywareblaster.html
SpywareGuard – http://www.wilderssecurity.net/spywareguard.html
WinPatrol – http://www.winpatrol.com/

Audio Creation

Gungirl Sequencer – http://ggseq.sourceforge.net/pmwiki.php/Main/HomePage
HammerHead – http://www.threechords.com/hammerhea…oduction.shtml
Jesusonic – http://www.jesusonic.com/soft.php
KRISTAL Audio Engine – http://www.kreatives.org/kristal/index.php
orDrumbox – http://ordrumbox.sourceforge.net/
Tu2 – http://www.brambos.com/news.html

Audio Players:

1by1 – http://www.rz.uni-frankfurt.de/~pesch
Billy – http://www.sheepfriends.com/?page=billy
CoolPlayer – http://coolplayer.sourceforge.net/
DeejaySystem MK1 – http://www.deejaysystem.com/prod_mk1.asp
DeliPlayer. http://www.deliplayer.com/
Foobar 2000 – http://www.foobar2000.org/
iTunes – http://www.apple.com/itunes/
Jet Audio Basic – http://www.jetaudio.com/
Mixere – http://mixere.sourceforge.net/
Mixxx – http://mixxx.sourceforge.net/
monoRAVEik – http://www.mono211.com/monoraveik/mr1200.html
MoreAmp – http://sourceforge.net/projects/moreamp/
Musik – http://musik.berlios.de/
musikCube – http://www.musikcube.com/
QCD Player – http://www.quinnware.com/
Sonique – http://sonique.lycos.com/
Winamp – http://www.winamp.com/
XMPlay – http://www.un4seen.com/xmplay.html
Zinf – http://www.zinf.org/

Audio Tools:

Audacity – http://audacity.sourceforge.net/
AudioShell – http://www.softpointer.com/AudioShell.htm
BeSweet – http://dspguru.doom9.net/
CDex – http://cdexos.sourceforge.net/
dBpowerAMP Music Converter – http://www.dbpoweramp.com/dmc.htm
EAC – http://www.exactaudiocopy.de/
Encounter 2003 – http://www.waschbusch.com/
GermaniXEncoder – http://www.germanixsoft.de/
K-MP3 – http://www.katarncorp.com/
KraMixer – http://www.kramware.com/
MP3 Book Helper – http://mp3bookhelper.sourceforge.net/
MP3 Tag – http://www.mp3tag.de/
Mp3 Tag Tools – http://massid3lib.sourceforge.net/
mp3DirectCut – http://www.rz.uni-frankfurt.de/~pesch/
MP3Gain – http://www.geocities.com/mp3gain/
mp3Trim –
MusicBrainz – http://musicbrainz.org/
Rarewares – http://rarewares.hydrogenaudio.org/
SoundEngine Free – http://www.cycleof5th.com/en/index.htm
TagScanner – http://xdev.narod.ru/tagscan_e.htm
The GodFather –
TigoTago – http://www.tigotago.com/

CD/DVD Burning:

Burn4Free – http://www.burn4free.com/
Burnatonce – http://www.burnatonce.com/
Burrrn – http://www.burrrn.net/
CDBurnerXP – http://www.cdburnerxp.se/
CDRDAO – http://cdrdao.sourceforge.net/
CDR Tools Frontend – http://demosten.com/cdrfe/
Deepburner – http://www.deepburner.com/
DVD Decrypter: http://fileforum.betanews.com/downlo…r/1011845169/1
Easy Burning, DropCD & Audio CD – http://www.paehl.de/cdr
ImgBurn – http://www.imgburn.com/

Compression / Decompression:

7-zip – http://www.7-zip.org/
bzip2 –
ExtractNow – http://www.extractnow.com/
FilZip – http://www.filzip.com/
Info-Zip – http://www.info-zip.org/
IZArc – http://www.florida.plus.com/izarc/
QuickZip – http://www.quickzip.org/
TUGZip – http://www.tugzip.com/
UPX – http://upx.sourceforge.net/
Zip&Go – http://www.handybits.com/zipngo.htm
Zipgenius – http://www.zipgenius.it/

Defrag Software:

DIRMS & Buzzsaw – http://www.dirms.com/
OpenVMS –

Photo manipulation and image design:

ArtRage – http://www.ambientdesign.com/artrage.html
Artweaver – http://www.artweaver.de/index.php?en_version
ColorPic – http://www.iconico.com/colorpic/
Delineate – http://delineate.sourceforge.net/
Inkscape – http://www.inkscape.org/
JPEGCrops – http://ekot.dk/programmer/JPEGCrops/
Paint .NET – http://www.eecs.wsu.edu/paint.net/
Pixia –
Pixie – http://www.nattyware.com/pixie.html
PhotoFiltre – http://www.photofiltre.com/
Sodipodi – http://www.sodipodi.com/
The Gimp – http://www.gimp.org/
Tuxpaint – http://www.newbreedsoftware.com/tuxpaint
Wax – http://www.debugmode.com/wax/
Wink – http://www.debugmode.com/wink/
WinMorph – http://www.debugmode.com/winmorph/

Programming:

ActivePerl – http://www.activestate.com/Products/ActivePerl
BlueJ – http://www.bluej.org/download/download.html
Crimson Editor – http://www.crimsoneditor.com/
Code::Blocks – http://www.codeblocks.org/
Context – http://www.context.cx/
Dev C++ – http://www.bloodshed.net/
Dev Pascal – http://www.bloodshed.net/
Digital Mars C++ – http://www.digitalmars.com/download/freecompiler.html
Eclipse – http://www.eclipse.org/
ExamDiff –
Freepascal – http://www.freepascal.org/
JCreator LE – http://www.jcreator.com/download.htm
jEdit – http://www.jedit.org/
Metapad – http://www.liquidninja.com/metapad/
Notepad++ – http://notepad-plus.sourceforge.net/uk/site.htm
Notepad2 – http://www.flos-freeware.ch/
Open Watcom – http://www.openwatcom.org/
Pelles C –
PHP Hypertext Parser – http://www.php.net/
Programmer’s Notepad – http://www.pnotepad.org/
PSPad – http://www.pspad.com/
Python – http://www.python.org/
Ruby –
SharpDevelop – http://www.icsharpcode.net/opensource/sd/
WebMatrix – http://www.asp.net/webmatrix/
WinMerge – http://winmerge.org/

Pop-up Blockers:

Google Toolbar –
NoAds – http://www.southbaypc.com/NoAds/
PopUp Stopper – http://www.panicware.com/product_psfree.html
Privoxy – http://www.privoxy.org/
Proxomitron – http://www.proxomitron.info/

RSS Readers:

Ablion – http://www.fileheaven.com/Abilon/download/14059.htm
BlogExpress – http://www.usablelabs.com/productBlogExpress.html
Feedreader – http://www.feedreader.com/
FireANT – http://www.antisnottv.net/
GreatNews – http://www.curiostudio.com/
RssBandit – http://www.rssbandit.org/
RSSOwl – http://www.rssowl.org/
RssReader – http://www.rssreader.com/
RSS Xpress – http://rssxpress.free.fr/en/?page=&idNews=
SharpReader – http://www.sharpreader.net/

System Information and monitoring:

AIDA32 – http://www.sofotex.com/AIDA32-download_L9326.html
ATITool – http://www.techpowerup.com/atitool/
ATI Tray Tools – http://www.guru3d.com/article/atitraytools/189/
CPU-Z – http://www.cpuid.com/cpuz.php
Gkrellm – http://bill.nalens.com/
K1 – http://clanpkm.free.fr/K1/?lng=en
Motherboard monitor – http://www.majorgeeks.com/download.php?det=311
SpeedFan – http://www.almico.com/speedfan.php
Sysmetrix – http://www.xymantix.com
WCPUID – http://hp.vector.co.jp/authors/VA002…/download.html
WhatsRunning – http://www.whatsrunning.net/whatsrunning/main.aspx

Video codecs:

DivX Codec – http://www.divx.com/divx/?src=toptab…rom_/index.php
FFDSHOW – http://sourceforge.net/projects/ffdshow
XviD – http://www.xvid.org/

Video players :

AC3Filter – http://sourceforge.net/projects/ac3filter
BsPlayer – http://www.bsplayer.org/
Crystal Player – http://www.crystalplayer.com/index.php?page=downloads
Cygwin MPlayer – http://armory.nicewarrior.org/projects/cygmp/
DivX Player – http://www.divx.com/
MaximusDVD – http://www.maximusdvd.com/
Media Player Classic – http://sourceforge.net/project/showf…group_id=82303
VideoLan – http://www.videolan.org/

Video tools:

DScaler – http://deinterlace.sourceforge.net/
FlasKMPEG – http://www.flaskmpeg.net
GSpot – http://www.headbands.com/gspot/
TMPGEnc – http://www.tmpgenc.net/e_main.html
VirtualDub – http://www.virtualdub.org/
VirtualDubMod – http://sourceforge.net/project/showf…group_id=65889
Zwei-Stein Video Editor – http://www.thugsatbay.com/software/index.html

Web browsers:

Firefox – http://www.getfirefox.com
K-Meleon – http://kmeleon.sourceforge.net/
Netscape – http://channels.netscape.com/ns/browsers/default.jsp
Opera – http://www.opera.com

Web servers:

Abyss – http://abyss.sourceforge.net/
Apache – http://httpd.apache.org/
Apache2Triad – http://apache2triad.net/
HTTP File Server – http://www.rejetto.com/sw/
Sambar – http://www.sambar.com/
Savant – http://savant.sourceforge.net/
SimpleServer:WWW – http://www.analogx.com/contents/down…work/sswww.htm
Smart Cache – http://scache.sourceforge.net/
TinyWeb – http://www.ritlabs.com/tinyweb/index.html
Xitami – http://www.xitami.com/

Webcam Software:

booruWebCam – http://www.booru.net/
Dorgem – http://dorgem.sourceforge.net/
grabMotion – http://www.grabmotion.com/
Pryme – http://www.hilo.dk/pryme/

Checksum Utilities:

fsum –
HashCalc –
hksfv – http://www.big-o-software.com/products/hksfv/
ICEECC – http://www.ice-graphics.com/ICEECC/IndexE.html
md5sum – http://www.etree.org/md5com.html
md5summer – http://www.md5summer.org/
MooSFV – http://www.ubercow.com/moosfv/
QuickPar – http://www.quickpar.org.uk/
QuickSFV – http://www.geocities.com/SiliconValley/Mouse/4668/

General Utilities And Other Applications:

AdShield – http://www.lossepladsen.dk/all4you/T…d/AdShield.php
AnalogX – http://www.analogx.com/
AppRocket – http://www.candylabs.com/approcket/
AutoIt –
BISS – http://www.bluetack.co.uk/index.php
Celestia – http://www.shatters.net/celestia
CCleaner – http://www.ccleaner.com
ClipX – http://bluemars.org/clipx/
Contact – http://www.isaacboy.com/contact.htm
Cygwin – http://www.cygwin.com
Dir2HTML – http://www.pc-tools.net/win32/dir2html/
Dirkey – http://www.protonfx.com/dirkey/
EasyCleaner – http://personal.inet.fi/business/toniarts/ecleane.htm
EditPad Lite – http://www.editpadpro.com/editpadlite.html
EssentialPIM – http://www.essentialpim.com/
Excessive-software – http://www.excessive-software.eu.tt/
Folder Size Extension – http://foldersize.sourceforge.net/
Hamsin Clipboard – http://www.iisr-cnc.com/hamsin/
HTTrack – http://www.httrack.com/
Inno Setup – http://www.jrsoftware.org/isinfo.php
KeyNote – http://www.tranglos.com/free/keynote.html
Language Identifier – http://www.languageidentifier.com/
Link Checker – http://www.relsoftware.com/rlc/
Memtest-86 – http://www.memtest86.com
Money Manager – http://www.thezeal.com/software/manager/default.asp
Multi Install – http://multiinstall.sourceforge.net/
MWSnap – http://www.mirekw.com/winfreeware/mwsnap.html
NetTime – http://nettime.sourceforge.net
Nullsoft Installer –
Open Subfolder – http://www.bubblepop.com/opensubfolder/index.html
Peerguardian – http://www.methlabs.org/
Process Explorer (aka ProcessXP) –
http://www.sysinternals.com/ntw2k/fr…/procexp.shtml
png2ico – http://winterdrache.de/freeware/png2ico
RegSeeker – http://www.hoverdesk.net/freeware.htm
Restoration – http://www3.telus.net/mikebike/RESTORATION.html
Startup Control Panel – http://www.mlin.net/StartupCPL.shtml
Stickies – http://finiteloop.org/~btaylor/software/stickies/
StrokeIt – http://www.tcbmi.com/strokeit/
Syncback – http://www.2brightsparks.com/freeware/freeware-hub.html
Sysinternals – http://www.sysinternals.com/
Toolbox – http://www.sil.org/computing/toolbox/
TreeSize – http://www.jam-software.com/freeware/index.shtml
TuneXP – http://www.driverheaven.net/dforce/s…?doc=txp_about
Turbo Pad – http://turbopad.sourceforge.net/
Unlocker – http://ccollomb.free.fr/unlocker/
Vim – http://vim.sourceforge.net
WeathAlert – http://www.ic.sunysb.edu/stu/msowul/?page=weathermain
WordWeb – http://wordweb.info/free/
XP AntiSpy – http://www.xpantispy.org/
YourDir – http://www.primeoption.com.au/FreewareYourDir.htm