NetZero has versions of its proprietary dial-up software for computers running Mac OS 9 or Mac OS X. NetZero previously offered a Linux version of the NetZero software advertised as being for Linspire, however the software could be installed on any Debian-based i386 or x86-64 Linux distribution, NetZero can also be installed on any RPM-based Linux distribution as long as Alien is used to convert the NetZero Debian package into an RPM package. In addition, the Linux version requires the Java Runtime Environment to be installed prior to use of the NetZero dialer. However the current Linux version of the dialer no longer functions properly with the service since 2009.