Open source software is similar in idea to "free software" but slightly less rigid than the free software movement. Users of open source software are (generally) able to view the source code, alter and re-distribute open source software. There is however less of an emphasis in the open source movement on the right of information and source code to be free and in some cases companies are able to develop proprietary products based on open source ones.

Open source software is software that is developed collaboratively by developers across the globe. The software itself is available at little or no cost. The source code (the human-readable version of the software) is distributed with the executable form, giving users of the software the freedom to modify, adapt and improve the software to meet their needs.