NomadBSD is described as 'persistent live system for USB flash drives, based on FreeBSD'. There are more than 100 alternatives to NomadBSD for a variety of platforms, including Linux, Self-Hosted solutions, BSD, Windows and Mac. The best alternative is Ubuntu, which is both free and Open Source. Other great apps like NomadBSD are Debian (Free, Open Source), Linux Mint (Free, Open Source), Manjaro Linux (Free, Open Source) and Arch Linux (Free, Open Source).
NodeOS is a lightweight operating system using Node.js as userspace and managed by npm. Any package in npm is a NodeOS package, which at last count was 244,180 packages. The goal of NodeOS is to provide just enough to let npm provide the rest.