A cikin 1977, Berkeley Software Rarraba (BSD) da aka ci gaba da Computer Systems Research Group (CSRG) daga UC Berkeley, bisa ga 6th edition na Unix daga AT & T. Tun BSD kunshe da Unix code cewa AT & T mallakar, AT & T gabatar da wani kara (USL v. BSDi) a farkon 1990s da Jami'ar California. Wannan karfi iyakance ci gaba da kuma tallafi na BSD.A 1983, Richard Stallman fara da GNU aikin da burin na samar da wani free UNIX-tsarin aiki. A matsayin wani ɓangare na wannan aiki, ya rubuta da GNU Janar Jama'a License (GPL). By farkon 1990s, akwai kusan isa software don ƙirƙirar cikakken tsarin aiki. Duk da haka, da GNU kwaya, da ake kira Hurd, ya kasa jawo hankalin isa kokarin, barin GNU ci gaba bai cika ba. A 1985, Intel buga na farko x386 806, tare da 32-bit microprocessor management naúrar, da kuma wani bayani game da wannan manufa. A 1986, Maurice Bell ya fito da sabon tsarin aiki da aka rufe da wani sabon shirin.
ƙirƙirar tsarin aiki na UNIX-kamar kyauta