The free software movement is a social movement which aims to enable users to access and modify software free of cost. The alternative terms "software libre", "open source", and "FOSS" are associated with the free software movement. Although drawing on traditions and philosophies among members of the 1970s hacker culture, Richard Stallman is widely credited with launching the movement in 1983 by founding the GNU Project.The free software philosophy at the core of the movement drew on core and incidental elements of what was called hacker culture by many computer users in the 1970s, among other sources.