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1- Apache Software Foundation - membership-based, not-for-profit corporation that exists to provide organizational, legal, and financial support for the Apache open-source software projects.

  http://www.apache.org/


2- Red Hat Software - Linux software Development Company.

  http://www.redhat.com/


3- GNU Project of the Free Software Foundation (FSF) - dedicated to eliminating restrictions on copying, redistribution, understanding, and modification of computer programs.
  http://www.gnu.org/


4- Business Software Alliance (BSA) - advances free and open world trade for legitimate business software by advocating strong intellectual property protection for software.

  http://www.bsa.org/


5- Free Software Project - Andrew Leonard's book-in-progress is also aiming to serve as an resource on the history and evolution of open source and free software.

  http://www.salon.com/tech/fsp/


6- Software Engineering Institute

  http://www.sei.cmu.edu/


7- IEEE Software - covers useful advances in software technology, design, and development and implementation techniques.

  http://www.computer.org/software/


8- Rational Software Corporation - develops software for the Internet and other platforms through tools, services, and best practices.

  http://www.rational.com/