ABC
Aspen Systems' Aspen Beowulf Cluster (ABC) management software is a true interactive cluster management tool that enables remote monitoring and management to the cluster from anywhere in the world. The ABC Software Management system is an umbrella of tools and utilities designed to manage, control and operate a Beowulf cluster from a single integrated application.

BOINC (Berkeley Open Infrastructure for Network Computing)
A BOINC project with a single Linux server can provide computing power equivalent to a cluster with tens of thousands of CPUs. Learn how to create and operate a BOINC project.

BlackLab Cluster Management
Black Lab is a cluster build and management application for HPC clusters running Yellow Dog Linux. It offers single-click installation and configuration, automated server and node software updates, a graphical user interface designed for both new and savvy cluster managers, control of multiple clusters, and for those who prefer --a full-featured command line interface.

C3
C3 tool suite was developed at Oak Ridge National Lab and implements a number of command line based tools that aid in the operation and management of clusters.

Cfengine
Cfengine is a tool for administration and configuration of large (or small) networks of computers. It uses the idea of classes to define and automate the configuration and maintenance of systems.

Clunix
The clunix tools are a free, GPL'd set of utilities for managing a Linux cluster. The components are a perl based load balancer, a php based web interface for monitoring the state of the cluster, and a daemon.

ClusterWorX
(Linux NetworX) is a management and monitoring package, that supports customized monitoring and notification, disk cloning, node management, and more.

Gluster
Gluster is a GNU cluster distribution aimed at commoditizing Supercomputing and Superstorage. Core of the Gluster provides a platform for developing clustering applications tailored for a specific tasks such as HPC Clustering, Storage Clustering, Enterprise Provisioning, Database Clustering etc.

Kerrighed
Kerrighed is a Single System Image operating system for clusters. Kerrighed offers the view of a unique SMP machine on top of a cluster of standard PCs. The goals of Kerrighed are high performance of applications, high availability of the cluster, efficient resources management, high customizability of the operating system and ease of use. Kerrighed is implemented as an extension to Linux operating system (a set of Linux modules and a small patch to the kernel).

openMosix
openMosix is a Linux kernel extension for single-system image clustering which turns a network of ordinary computers into a supercomputer.

openMosixview
openMosixview is a complete rewrite of the original Mosixview code. It is a cluster management GUI for an openMosix cluster.

openSSI
The OpenSSI project is a comprehensive clustering solution offering a full, highly available SSI environment for Linux. Goals for OpenSSI Clusters include availability, scalability and manageability, built from standard servers. Technology pieces include: membership, single root and single init, cluster filesystems and DLM, single process space and process migration, load leveling, single and shared IPC space, device space and networking space, and single management space.

Performance Co-Pilot
PCP is from the folks at SGI, and can serve as both a monitoring and management system for a system or cluster.

Platform Open Cluster Stack (OCS)
A pre-integrated, vendor certified, software stack that enables the consistent delivery of scale-out application clusters. OCS enables a new class of users by simplifying Linux cluster application, deployment and management. Platform OCS is a modular and hybrid stack that transparently integrates open source and commercial software into a single consistent cluster operating environment.

PowerCockpit
PowerCockpit is a tool for installing and managing large groups of servers.

Quattor Tool Suite
Quattor is a system administration toolkit providing a powerful, portable and modular toolsuite for the automated installation, configuration and management of clusters and farms running UNIX derivates like Linux and Solaris

ShaoLin Aptus
ShaoLin Aptus introduces to the Linux operating system innovative "Fit Client" network computing architecture. It provides a complete desktop system management solution for enterprises that desire secure and low cost desktop computing environment with high availability.

SUT
SUT is a collection of standard UNIX utilities, like ls, rm, cp, etc., that are targeted at cluster use.

Warewulf Cluster Project
A system for replicating and managing small, lightweight Linux systems from one master.