This is a category for mobile software that meets The Free Software Definition . That is to say that users can freely use, study, copy, redistribute, modify, and publish modified versions of the software, making it " free software " or " open-source software ". In practical terms, this means either software whose source code has been released into the public domain , or software which is distributed with a free software license , including, but not limited to, the list of FSF approved software licenses , and whose source code is available to anyone who receives a copy of the software.