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Richard Stallman"Open Source"  vs "Free Software"?
  What is "Free Software"? 
  What is "Open Source"?
Free Software movement (GNU project) started in by Richard M. Stallman (RMS) in 1984 . (GNU is an abbreviation for "GNU is Not Unix").
Freedom in his (RMS) definition is freedom to run, copy, distribute, study, change and improve the software.
"Free software"' is a matter of liberty, not price. To understand the concept, you should think of "free speech"', not "free beer"
The software may be free regardless of the price, because users have freedom in using it. 
The software may be non-free even if it is given away at no charge sometimes (if it is not free for users to change it, distribute it, etc.)
 "Open Source" doesn't necessarily means freedom either (it only means that you can look at the code).
FSF (Free Software Foundation) provides several licenses:
www.gnu.org/copyleft/gpl.html - GNU GPL (General Public License)
www.gnu.org/copyleft/lesser.html - GNU Lesser (Library) GPL - allows non-free propriatary programs to use libraries and still stay non-free.
  Different Open Source projects use various other licenses.  Perl software, for example, may be distributed under either GNU GPL or Artistic License.
  Read more at GNU central site: 
   see also:
www.gnu.org/philosophy/amazon.html - Boycott Amazon!
www.linux.org - Linux
www.linux.org - Linux (also see my Linux page - linux.html )
www.gnome.org - Gnome desktop (Windows) 
www.perl.com - Perl (also seemy perl page - perl.html )
www.apache.org - Apache project
www.python.org - Python ( also www.pythonlabs.com  )
www.zope.org - Zope
www.mozilla.org - Mozilla project
www.bsd.org - BSD
www.php.net - PHP
www.sendmail.org - sendmail
www.aolserver.com - AOL web server
www.mysql.com - MySQL database
www.opensource.org/ - Open Source Initiative (OSI)
    www.opensource.org/halloween/ - The Halloween Documents
sourceforge.net/ - SourceForge - a free service to Open Source developers offering easy access to the best in CVS, mailing lists, bug tracking, message boards/forums, task management, site hosting, permanent file archival, full backups, and total web-based administration.
osdn.com/ - Open Source Development Network
www.questionexchange.com - question exchange
www.openmagazine.net - Open magazine
conferences.oreilly.com/oscon2000/ - O'Reilly Open Source Convention (July, 2000)
opensource.oreilly.com/ - O'Reilly Open Source website
directory.google.com/Top/Computers/Open_Source/ - Open Source on Google.com
Languages/Java/Open_Source/Java_Implementations/ - Open Source Java
oingo.com/topic/83/83585.html - Java Open Source Application Servers
oingo.com/topic/83/83584.html - Java Open Source Server-Side Code
oingo.com/topic/11/11674.html - Open Source Java
Languages/Java/Open_Source/ - Open Source Java
it.about.com/compute/it/msubos1.htm -some articles
www.tuxedo.org/~esr/  - Eric Steven Raymond's Home Page
      ( www.tuxedo.org/~esr/writings/ - his writings)
Misc.Links home - top of the page -

www.winehq.com - Wine is an implementation of the Windows 3.x and Win32 APIs on top of X and Unix.
Wine provides:
  -- a development toolkit (Winelib) for porting Windows sources to Unix
  -- a program loader, allowing unmodified Windows 3.1/95/NT binaries to run under Intel Unixes. So, now you can run UltraEdit or MS Excell 2000 on Unix.  Cool!

www.delorie.com - has many docs for open source (GNU) soft
www.sgi.com/developers/oss/ - open source at SGI (Silicon Graphics)
slashdot.org/ - news for nerds
freshmeat.net/ -
thinkgeek.com/ - T-shirts, mugs, etc.
www.themes.org/ - Themes for screen
www.napster.com - music site