Most of these programs have versions for Windows as well as Gnu/Linux.
I have used a lot of them but not all.
A lot of the games I have not tried yet.

Audio AUDACITY - Audio recording & editing program
Win, Gnu/Linux, Mac Use
Ardour - Audio recording & editing program Gnu/Linux, Mac Not Tried
CDEX - cd ripping tool Win Use
Web/Internet FIREFOX - web browser Win, Gnu/Linux, ? Use
FILEZILLA - ftp client & server Win Use
SeaMonkey - Web-browser, advanced e-mail and newsgroup client, IRC chat client, and HTML editing made simple -- all in one program Win, Gnu/Linux, Mac, Other
Not Tried

PUTTY - An SSH client Win, Unix Use
WINSCP - sftp client Win Use
OPENSSH FOR WINDOWS -  ssh server Win Not Tried
HTTP://OPENSSH.COM - other open ssh resources
Win, Gnu/Linux, Mac, BSD, other Use
Office/desktop OPENOFFICE.ORG - word processor, spread, sheet, database, draw, Export to PDF
win, Gnu/linux, mac Use
SCRIBUS - desktop publishing, Export to PDF win, Gnu/linux Use
PDFCREATOR - Create pdf files by sending files to the pdfcreator printer driver. win
Finance GNUCASH - GnuCash is personal and small-business financial-accounting software. GNU/Linux, Mac
Not Tried
CD Burning CDRTOOLS - CD burning software for the command line Win, Gnu/Linux, Mac, Other Use in Gnu/Linux
CDRTOOLS FE - Win32 CDR Tools Front End.  This freeware.  I only added it here because is a front end for CDRTOOLs.  I haven't tried it yet but do plan to. Win

Not tried

Picture & Image Editing GIMP - GIMP is the GNU Image Manipulation Program. It is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. win, Gnu/Linux, Mac

INKSCAPE - Inkscape is an Open Source vector graphics editor, with capabilities similar to Illustrator, Freehand, CorelDraw, or Xara X using the W3C standard Scalable Vector Graphics (SVG) file format. Win, Gnu/Linux, Mac

Learning to use.

Programming NVU - A what you see is what you get html editor (for creating web pages). Win, Gnu/Linux
Tools 7zip - compression program (like winzip) Win, Gnu/Linux Use
Education Tux Typing - Tux Typing" is an educational typing tutor for children. It features several different types of gameplay, at a variety of difficulty levels. Win, Gnu/Linux, Mac, Other Used (fun)

Games THE BATTLE FOR WESNOTH - A Warcraft type game Win, Gnu/Linux Not Tried
CRACK ATTACK - like the game tetris attack
Win, Gnu/Linux, Mac Play This
Brutal Chess - Brutal Chess features full 3D graphics, an advanced particle engine, and several different levels of intelligent AI, inspired by the once popular "Battle Chess" released by Interplay circa 1988.  This game is in a beginning type stage. Win, Gnu/Linux, Mac


NEVERBALL - cool puzzle game

Win, Gnu/Linux, Mac Played this
XEVIL - XEvil is a 3rd person, side-view, fast-action, kill-them-before-they-kill-you game. Fight against either computer-controlled enemies, or another player. Win, Gnu/Linux, Mac
Not Played

SECRET MARYO CHRONICLES-Mario brothers clone Win, Gnu/Linux Not Played
SUPER TUX - Mario Brothers clone
Win, Gnu/Linux, Mac Played
FOOBILLIARD - A billiards game (pool) Win, Gnu/Linux Not played
BOMBERCLONE - Bomberman clone Win, Gnu/Linux Not played
Egoboo - Adventure game
Win, Gnu/Linux, Mac Not Played
NETHACK - Role playing game Win, Gnu/Linux, Not Played
SLAM SOCCER - a soccer game Win, Gnu/Linux Not Played
SPACE INVADERS OPENGL - Space Invaders clone Win Not Played
GNU CHESS -  a chess game
Win, Gnu/Linux, Mac Not Played
LBREAKOUT - a breakout clone
Win, Gnu/Linux, Mac Not Played
Ubuntu - A Gnu/Linux Distribution, The install CD is also a Live CD.
Free DOS - A free version of DOS DOS Used
React OS - project is dedicated to making Free Softwware available to everyone by providing a ground-up implementation of a Microsoft Windows® XP compatible operating system. Win

To contact  me email me at: bomb at bloodkeg dot com