The wonders of open-source. It's free, takes up less space than other software and is usually better aswell! Post your links to Open-source software (and OS's if you want) in this topic, I'll put the links in this post.

Just to define OSS, it is software that the source code that can be viewed by anyone and that you are free to edit the software. If it's made by big companies i.e. MS, Apple, there's a chance that it isn't open source (more likely with MS ;))

A NOTE:- As far as I know, these programs are mostly for Windows (except for Darwine). There are some links to Mac/Linux ports/versions on these sites, but if you can't find them, post here, PM or e-mail me and I'll try and find them.

NEW NOTE (Fri 16 May):- I'm gonna start posting less WIndows programs and more Linux programs, since I've started using Ubuntu.

Here are mine:-

Tremulous (Used by me)
An online FPS game, originally a Quake mod, now a stand-alone game.
www.tremulous.net

7-zip (Used by me)
An archive manager (????) that can unpack ZIP files, RAR files and many others, including it's own format, 7z.
www.7-zip.org

Firefox (Used by me)
You should know this one! With the amount of themes and extensions you can get for it, it is THE browser...reloaded *canned laughter*
www.mozilla.com/firefox/

Thunderbird
The best of Firefox (add-ons, themes) now in your mailbox! More secure than Outlook, and more flexible (thanks Starforce!)
MGCV Note: this is an e-mail client, since I have been asked what the difference between this and Firefox is.
www.mozilla.com/thunderbird/

Ubuntu (operating system)
One of the many distro's of Linux, this is one of the best. It supports Live CD, so you needn't install a new OS onto your PC. It is one brilliant OS.
www.ubuntu.com

Open Office.org (Used by me)
An office suite that includes support for Microsoft Office files (including Office 2007). It isn't an MS Office clone, but it is great value for money...wait...that doesn't make sense...(it's free) (doesn't have publisher support as far as I know)
www.openoffice.org

GIMP (Used by me)
This one doesn't need to be explained, it's basically a Photoshop replacement (doesn't have all the features however, so basically like Photoshop Elements).
www.gimp.org

FLV Player (Used by me)
A .flv video player. This is useful if you have DownloadHelper for Firefox and download videos off of YouTube.
Link from download.com, can't find the homepage :LOL:

Vista Drive Icon (Used by me)
Replaces your current drive icon with a Vista style one, with a bar showing remaining space.
www.drvicon.sourceforge.net

Joomla
Used for website building, but instead of showing off your 1337 html/css skills (like Dreamweaver and Frontpage) it's used to make content-rich sites with a minimal of f**king around.
MGCV Note:- It only works on paid-for webspace, and you must already have the webspace running to use it.
www.joomla.org

PSUbuntu (operating system)(for PS3)(used by me)
This is one of the Linux distros that are available for PS3. This one is Ubuntu, which I've mentioned above. Use the guides to...well...guide you to installing it.
MGCV Note:- Do exactly as it says in the installation instructions on the site, especially when burning the disk. You MUST use that software listed.
www.psubuntu.com

Frets on Fire(Used by me)
A Guitar Hero clone, which is played by holding the keyboard like a guitar.
MGCV Note:- If you have any Guitar Hero or Rock Band controller, you can use them on Frets on Fire. PM/E-mail me for info and links to the instructions (only know about GH controllers for PS3 however)
http://fretsonfire.sourceforge.net/

Yellow Dog Linux(operating system)(for PS3)
This is one of the Linux distros that are available for PS3. This one is Yellow Dog (a.k.a. YDL) There are also versions for Apple Power PC and IBM Cell.
MGCV Note:- Beware, 3.3 GB ISO size, requires a DVD-R/RW, portable storage media and a fast fraggin' connection or else you'll be waiting for 3 days before the download finishes.
http://www.terrasoftsolutions.com/products/ydl/

Wine(for Linux/Unix)
This software allows you to run Windows 9x/NT/2000/XP, 3.x and DOS programs on Linux, Unix and other POSIX (????) based operating systems)
MGCV Note:- Look further down for the Mac equivalent of this software.
http://www.winehq.org/

Here are suggestions from other members. When contributing, please describe it and give links to their homepage if possible.

Fedora (operating system)(suggested by Subaru)
A well-known Linux distro. this is special for *mumblemumble*.
http://fedoraproject.org/

Debian (operating system)(suggested by Subaru)
A popular and influential Linux distribution, the basis for several other distributions, including Knoppix, Linspire, MEPIS, sidux, Xandros, and the Ubuntu family. (thanks again Starforce!)
http://www.debian.org/

Pidgin (suggested by Starforce)
A multiprotocol Instant Messaging client. Runs on Windows and Linux.
http://www.pidgin.im/

aMSN (suggested by Starforce)
An MSN Messenger clone available for Windows, Linux and Mac. Supports Skins and Plugins.
http://www.amsn-project.net/index.php

Abiword (suggested by Starforce)
A free word processing program.
http://www.abisource.com/

Audacity (suggested by StarForce)(Used by me)
An open source sound editor.
MGCV Note:- if you have 'Frets on Fire' you can use this to save your MP3s as .ogg files needed, as FOF only supports that filetype.
http://audacity.sourceforge.net/


DOSBox (suggested by Starforce)
A DOS emulator for Windows, Linux and Mac OS. It can be used to run old games/software for DOS which don't work in newer versions of Windows.
http://www.dosbox.com/

SpeedCrunch (suggested by Starforce)
An open source calculator for Windows, Linux and MacOS.
http://speedcrunch.org/en/index.html

ClamWin (suggested by Starforce)
A Free Antivirus program for Microsoft Windows 98/Me/2000/XP/2003 and Vista. It hasn't on-access real time protection, but it can scan folders/files/drives on demand.
http://www.clamwin.com/

VLC Media Player (suggested by Starforce)
A crossplatform Mediaplayer. It's available for Windows, Linux and MacOS. It can play several formats of audio and video.
http://www.videolan.org/vlc/

Free Serif Software (suggested by KingofKingz750)
Its an image,web, document and more editor thingy.
http://www.freeserifsoftware.com/

Pixia (suggested by KingofKingz750)
Its the japanese version to paint.
MGCV note: This link gives links to other languages aswell, but not English.
About.com link

ArchLinux (Operating System)(suggested by sploodge)
A Complicated-to-set-up UNIX-based OS
www.archlinux.org

FreeBSD (Operating System)(suggested by sploodge)
A Complicated-to-set-up UNIX-based OS
www.freebsd.org

Darwine(suggested by Starforce for ShadowZero.EXE)(for Mac only)
Darwine is a port of the Wine libraries to Darwin and Mac OS X.
MGCV Note:- Basically, it allows you to run Windows programs on a Mac, similar to Wine shown above)
http://darwine.sourceforge.net/

FDM - Free Download Manager(suggested by StarForce)
It is a powerful, easy-to-use and absolutely free download accelerator and manager. Moreover, FDM is 100% safe, open-source software distributed under GPL license.
http://www.freedownloadmanager.org/

Blender (suggested by 1234Swordy)
Blender is a good strong free 3d animation program
www.blender.org

Emesene (suggested by Starforce)
An Instant Messenger for the Windows Live Network. Available for Windows and many Linux distributions. Supports skins and plugins (e.g. Messenger Plus colors)
http://emesene.org/index.html

Wubi (suggested by Starforce)(could be an OS)
Wubi is an officially supported Ubuntu installer for Windows users that can bring you to the Linux world with a single click. Wubi allows you to install and uninstall Ubuntu as any other Windows application, in a simple and safe way.
Note: Wubi is also included in the latest Ubuntu and Kubuntu versions, Hardy Heron.
http://wubi-installer.org

Pencil(Suggested by 1234Swordy)
Pencil (open source software) is a tradition computer animation software that lets you create your very own animation even a mini series!
http://www.les-stooges.org/pascal/pencil/index.php?id=Home

JAHSHAKA(Suggested by 1234Swordy)
JAHSHAKA is an open source movie maker that is very powerful and lets you add layers; add special effects; import 3d objects; time line control and lots more!
MGCV Note: (From 1234Swordy) This software may have a deep learning curve but there are video tutorials on youtube and online documents on their website so download and start video editing!
http://jahshaka.org/

Here are suggestions from other people that you won't know.

Axcrypt
An encryption program. It can also truly permanently delete files.
http://www.axantum.com/AxCrypt/

Amarok(Linux/Unix only)(Used by me)
A music player that is just pure awesome. It's easy to use, supports playlists, and much more.
MGCV Note:- This has a complicated install method, it requires using the package manager (e.g. Synaptic in Ubuntu). You must allow it to look for files packages online, and the search 'amarok'. You must also install the files that it requires, the package manager should give you that option.
http://amarok.kde.org/


Please contribute, as long as it's open-source!

Thread pinned but You may update it.

Added GIMP, how could I forget that

EDIT: Added Hex Workshop aswell (thanks Wesley Buster!)
EDIT2: Removed Hex Workshop temporarily, it may not be open source

No problem cherv :D. It helped me and now it gonna help u.

Added FLV Player

If Ubuntu is here Fedora Core must be TOO!!!
and of course highest king of kings - DEBiAN!!!

Sure, just give links to their homepages if possible.

Pidgin, a multiprotocol Instant Messaging client. Runs on Windows and Linux.
Homepage: http://www.pidgin.im/

aMSN, a MSN Messenger clone available for Windows, Linux and Mac. Supports Skins and Plugins.
Homepage: http://www.amsn-project.net/index.php

Ummm... and a description for Thunderbird... could be like "The best of Firefox (add-ons, themes) now in your mailbox! More secure than Outlook, and more flexible"

meebo.com IM client for google talk, AIM, MSN, and Yahoo

ebuddy.com same as above excluding google talk.

I forgot other open softwares...

Abiword: a free word processing program.
Homepage: http://www.abisource.com/

Audacity: an open source sound editor.
Homepage: http://audacity.sourceforge.net/

DOSBox: a DOS emulator for Windows, Linux and Mac OS. It can be used to run old games/software for DOS which doesn't work in newer versions of Windows.
Homepage: http://www.dosbox.com/

Thanks a lot! Sorry I wasn't on yesterday, I'd just bought Guitar Hero 3 for my PS3 (the best game ever!!!)

EDIT: @KOK: I meant open source software, those are IM clients.

Forgive for dbl post edit won't work...

http://www.freeserifsoftware.com/ Its an image,web, document and more editor thingy.

pixia

Its the japanese version to paint.

Now, here I am with more Open Source Softwares :D

SpeedCrunch: An open source calculator for Windows, Linux and MacOS.
http://speedcrunch.org/en/index.html

ClamWin: a Free Antivirus program for Microsoft Windows 98/Me/2000/XP/2003 and Vista. It hasn't on-access real time protection, but it can scan folders/files/drives on demand.
http://www.clamwin.com/

VLC MediaPlayer: A crossplatform Mediaplayer. It's available for Windows, Linux and MacOS. It can play several formats of audio and video.
http://www.videolan.org/vlc/

Umm... I have a suggestion, there could be a screenshot of each program (I know, in the webpages there are, but some people is too lazy to search for them). I can take screenshots of some apps.

EDIT: And a description for Debian... "A popular and influential Linux distribution, the basis for several other distributions, including Knoppix, Linspire, MEPIS, sidux, Xandros, and the Ubuntu family." (taken from Wikipedia)

You have loads of suggestions, you might know more than my friend.

I might add screenshots, I'll think about that.

Add ArchLinux! And FreeBSD! Complicated-to-set-up UNIX-based OSes FTW!

Added, and I've also added the Vista Drive Icon. Also, I've added a 'Used by me' note by each one.

Oh, come on! Have a better description! FreeBSD and ArchLinux are minimalistic so they aren't as over-bloated as, say, Fedora or Ubuntu. You set up what services the you want to run and in the end you have a faster running system :)

But, then again, there is some truth in that description :p

They were your descriptions.

...

Look! A distraction!

Look! A spam post! :Tounge2:

I couldn't quite figure out if this is already added to the list or not, but I'll ask anyways.

Is there a Windows Emulator for the Macintosh OS X? If so, what is it? :D

Megacherv do you know that as your the creater of this topic and that is pinned you can do double posts or triple? if not now you do anyway can i change my fire fox skin?? if yes how and where can i find skins ??

Firefox calls them themes. GO to tools, then add-ons, then click themes, then click 'Get Themes'. It'll open a new tab with the themes page.

Yay! I have slightly more power here!

thanks for the info and not really you can just double post without no one yelling at you and stuff not more

Look this: http://darwine.sourceforge.net/ :D

Uh, and a description: "Darwine is a port of the Wine libraries to Darwin and Mac OS X."

We had some at my workplace when I was on work experience, but that you had to pay for. Anyway, ADDED (in a bit)

Wow, I use a lot of those. Mostly because they are good, and I hate Microsoft.

One question. What's the difference between Firefox, and Thunderbird?

And is TREMULOUS, good?

Tremulous IS fun! And Firefox is an internet browser, and Thunderbird is an e-mail client.

Ah, I understand now. Thanks. I'll install tremulous right now. :)

Added PSUbuntu. If there are any more PS3 linux distro's you want me to add, PM me or suggest them here. I'll find the descriptions and links.

About Tremulous...Do you have to be online to play it?

Yes you do

ADDED:-
Frets on Fire, you have to check this out, the tutorial level is hilarious. You can also e-mail me via TREZ if you wish.

I have a new Open Source Software!

FDM - Free Download Manager
It is a powerful, easy-to-use and absolutely free download accelerator and manager. Moreover, FDM is 100% safe, open-source software distributed under GPL license.
Homepage: http://www.freedownloadmanager.org/

ADDED:-
FDM
Yellow Dog Linux
Wine
Other stuff...

I've made a copule of edits, pay attention to the 'MGCV Note's, they have some good (and sometimes vital) information.

blender is a good strong free 3d animation software that you can get at www.blender.org

ADDED

I've got more.

Emesene - http://emesene.org/index.html
An Instant Messenger for the Windows Live Network. Available for Windows and many Linux distributions. Supports skins and plugins (e.g. Messenger Plus colors)

Wubi - http://wubi-installer.org
Wubi is an officially supported Ubuntu installer for Windows users that can bring you to the Linux world with a single click. Wubi allows you to install and uninstall Ubuntu as any other Windows application, in a simple and safe way.
Note: Wubi is also included in the latest Ubuntu and Kubuntu versions, Hardy Heron.

ADDED, and thanks for the Wubi link, that will be awesome as soon as I upgrade my laptop's RAM tomorrow.

And also... some info about Wubi:

Wubi can work in many ways:

1) Downloading the ISO of Ubuntu/Kubuntu Hardy Heron and putting it in the same folder as the Wubi Installator.

2) Wubi can download the ISO image by itself (but it was REALLY slow for me)

3) Running the Wubi version included in Ubuntu/Kubuntu Hardy Heron CD or ISO. You don't need to download anything if you have the CD.

The Ubuntu installation will have almost the same performance as a normal one. Disk access will be a little slower (for me it's okay, I don't think it's slow., and that doesn't affect additional hard disks). Also, Hibernation is not available in a Wubi installated Ubuntu (since you have a laptop, that would be a drawback)

Wubi is now working perfectly on my laptop, although I have to use my Wifi Max dongle, since Ubuntu won't recognise my laptop's wireless hardware.

This is gonna sound weird, since this is my own topic, but doesn anybody know a DVD Player software package for Ubuntu, or Linux is general? Ubuntu's built in movie player won't work, and Amarok (must add) doesn't support any movie playback.