Porteus Alternatives

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.

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

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

Open Source

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

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

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

Open Source

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

Home, overview and getting started with Puppy Linux, amazingly fast, fascinatingly complete and delightfully small Linux.‎Wiki · ‎Download latest Puppy Linux .

CRUX is a lightweight Linux distribution for the x86-64 architecture targeted at experienced Linux...

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

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.

OpenKiosk is a cross platform kiosk web browser based on Mozilla Firefox that can be easily installed and used to secure a computer for use as a public terminal.