Neptune is described as 'GNU/Linux Distribution for desktops based fully upon Debian Stable. It ships with a modern KDE Plasma Desktop with its main view on a good looking multimedia system which allows for getting work done' and is a Linux Distro in the os & utilities category. There are more than 50 alternatives to Neptune for a variety of platforms, including Linux, Self-Hosted, Windows, BSD and Raspberry Pi apps. The best Neptune alternative is Linux Mint, which is both free and Open Source. Other great apps like Neptune are Ubuntu, Debian, Fedora and Arch Linux.