Lubuntu - 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.
Ubuntu - Ubuntu is a Debian Linux-based open source operating system for desktop computers.
Xubuntu - Xubuntu – Xubuntu is an elegant and easy-to-use operating system. Download XubuntuXubuntu – Xubuntu is an elegant and easy-to-use operating system. Feature Tour.
Fedora - Fedora creates an innovative, free, and open source platform for hardware, clouds, and containers that enables software developers and community members to build tailored solutions for their users.
CentOS - CentOS is a community-supported, free and open source operating system based on Red Hat Enterprise...
DistroWatch - 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.