Open-Source Software (OSS) refers to software that is freely available for use, modification, and distribution by anyone. The source code is openly shared, allowing users to study, change, and improve it.

• Examples include:
  i. Linus Kernel
  ii. GNU utilities and compilers
  iii. My SOL
  iv. Samba
  v. BSD Operating System
  vi. Apache
  vii. D Space
  viii. Perl
  ix. Ubentu
  x. Open office