CRUX Linux Alternatives

Simple operating system based on Linux that uses "modules", and loads everything into RAM. Can be persistent too.

FatDog64 is the lightweight 64-bit multi-user Linux distribution.

Holistic service management: service, support + customer care. From Ticketing to Helpdesk, Service Desk, ITSM to Enterprise Service Management

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Dietpi is a debian based operative system made to install new apps easyer.

Open Source

Learn how to install Porteus, about Porteus modules and getting porteus to work with wifi internet.

Plop Linux is a small distribution built from scratch that can boot from CD, DVD, USB flash drive...

DebianDog is very small Debian Live CD shaped to look and act like Puppy Linux.

runs all your existing IBM OS/2 programs on today's hardware

9 hours ago - It does include a proprietary software set optimized for business users, students, researchers and developers." A list of features and further details can be found in the company's release announcement.

Mezzano is another operating system that is written in a common lisp.

ToaruOS is the complete operating system for the desktop operating system of ARMv8.

IBM OS/2 is a series of computer operating systems that is created by Microsoft and IBM under the leadership of software designer Ed Iacobucci.

Ubuntu is a Debian Linux-based open source operating system for desktop computers.

Open Source

Lubuntu is a fast and lightweight operating system with a clean and easy-to-use user interface. The core of the system is based on Linux and Ubuntu. Lubuntu uses the minimal desktop LXDE, and a selection of light applications.