According to the definition in wikipedia, "Open source code evolves through community cooperation". lol! :-) Open source software <https://mail.google.com/wiki/Open_source_software> is software whose source code is published and made available to the public, enabling anyone to copy, modify and redistribute the source code without paying royalties or fees. Open source code evolves through community cooperation. These communities are composed of individual programmers as well as very large companies. Examples of open-source software products are: [19]<https://mail.google.com/mail/html/compose/static_files/blank_quirks.html#cite_note-18> - GNU Project <https://mail.google.com/wiki/GNU_Project> — “a sufficient body of free software” - FreeBSD <https://mail.google.com/wiki/FreeBSD> — operating system<https://mail.google.com/wiki/Operating_system>derived from Unix <https://mail.google.com/wiki/Unix> - Alfresco <https://mail.google.com/wiki/Alfresco_(software)> — content management system<https://mail.google.com/wiki/Content_management_system> - Apache <https://mail.google.com/wiki/Apache_HTTP_Server> — HTTP web server - Tomcat web server <https://mail.google.com/wiki/Apache_Tomcat> — web container - Drupal <https://mail.google.com/wiki/Drupal> — content management system <https://mail.google.com/wiki/Content_management_system> - Eclipse <https://mail.google.com/wiki/Eclipse_(software)> — software development environment comprising an integrated development environment<https://mail.google.com/wiki/Integrated_development_environment>(IDE) - Joomla <https://mail.google.com/wiki/Joomla> — content management system <https://mail.google.com/wiki/Content_management_system> - Linux <https://mail.google.com/wiki/Linux> — operating system<https://mail.google.com/wiki/Operating_system>based on Unix <https://mail.google.com/wiki/Unix> - Mediawiki <https://mail.google.com/wiki/Mediawiki> — wiki<https://mail.google.com/wiki/Wiki>server software, the software that runs Wikipedia - MongoDB <https://mail.google.com/wiki/MongoDB> — document-oriented, non-relational database - Moodle <https://mail.google.com/wiki/Moodle> — course management system<https://mail.google.com/wiki/Course_management_system>or virtual learning environment<https://mail.google.com/wiki/Virtual_learning_environment> - Mozilla Firefox <https://mail.google.com/wiki/Mozilla_Firefox> — web browser - Mozilla Thunderbird <https://mail.google.com/wiki/Mozilla_Thunderbird>— e-mail client - OpenBSD <https://mail.google.com/wiki/OpenBSD> — operating system<https://mail.google.com/wiki/Operating_system>derived from Unix <https://mail.google.com/wiki/Unix> - OpenOffice.org <https://mail.google.com/wiki/OpenOffice.org> — office suite - openSIS <https://mail.google.com/wiki/OpenSIS> — open source Student Information System - OpenSolaris <https://mail.google.com/wiki/OpenSolaris> — Unix Operating System from Sun Microsystems - osCommerce <https://mail.google.com/wiki/OsCommerce> — ecommerce<https://mail.google.com/wiki/Ecommerce> - PeaZip <https://mail.google.com/wiki/PeaZip> — File archiver<https://mail.google.com/wiki/File_archiver> - PHP <https://mail.google.com/wiki/PHP> - Scripting language suited for the web - RenovatioCMS <https://mail.google.com/wiki/RenovatioCMS> — content management system<https://mail.google.com/wiki/Content_management_system> - Stockfish <https://mail.google.com/wiki/Stockfish_(chess)> — chess engine <https://mail.google.com/wiki/Chess_engine> series, considered to be one of the strongest chess programs of the world - Symbian <https://mail.google.com/wiki/Symbian> — real-time<https://mail.google.com/wiki/Real-time_operating_system>mobile operating system <https://mail.google.com/wiki/Operating_system> - TYPO3 <https://mail.google.com/wiki/TYPO3> — content management system<https://mail.google.com/wiki/Content_management_system> - WordPress <https://mail.google.com/wiki/WordPress> — blog software<https://mail.google.com/wiki/Blog_software> - 7-Zip <https://mail.google.com/wiki/7-Zip> — File archiver<https://mail.google.com/wiki/File_archiver> - *Many, many more* --- Saidia-Ohh-Saidia Apps Made in KE aka Mkate Nusu---