Lubuntu is described as 'Fast and lightweight operating system with a clean and easy-to-use user interface. It is a Linux system, that uses the minimal desktop LXDE/LXQT' and is a very popular Linux Distro in the os & utilities category. There are more than 100 alternatives to Lubuntu for a variety of platforms, including Linux, Self-Hosted, Windows, Mac and Raspberry Pi apps. The best Lubuntu alternative is Linux Mint, which is both free and Open Source. Other great apps like Lubuntu are Ubuntu, Fedora, Zorin OS and Manjaro Linux.
KolibriOS is a tiny yet incredibly powerful and fast operating system. This power requires only a few megabyte disk space and 8MB of RAM to run. Kolibri features a rich set of applications that include word processor, image viewer, graphical editor, web browser and well over 30...
Bedrock Linux is a meta Linux distribution which allows users to utilize features from other, typically mutually exclusive distributions. Essentially, users can mix-and-match components as desired. For example, one could have:
ArchBang is a simple GNU/Linux rolling release distribution which provides you with a lightweight Arch Linux system combined with the Openbox Window Manager.
AnduinOS is a custom Ubuntu-based Linux distribution that aims to facilitate developers transitioning from Windows to Linux by maintaining familiar operational habits and workflows.
Edubuntu is an Ubuntu-based operating system that's designed for educational use in schools and other educational institutions.
Netrunner is an Debian -based distribution with a focus on desktop computing. It boasts a carefully tuned KDE Plasma Plasma 5 desktop.
Elive provides a dynamic and clean interface without saturating the look. Nothing in the desktop is static. Simplicity and intuitive is one of its best points.
A project providing a fully free (as in freedom) derivative of Arch Linux. Inheriting Arch's lightweight and flexibility, Parabola offers software freedom plus all power to the users.
Pardus is a GNU/Linux distribution funded and developed by the Scientific & Technological Research Council of Turkey (TÜBITAK). Pardus’ main focus is home use and office-related work with a user-friendly graphical interface using Gnome or Xfce desktop environments.
EasyOS is an experimental Linux distribution that uses many technologies and package formats pioneered by Puppy Linux .
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This is the lightest Linux I could find. Worked fast even on decade old notebook with 1 giga ram. Apps options are limited though.