Parallax SSH provides an interface to executing commands on multiple
nodes at once using SSH. It also provides commands for sending and receiving files to
multiple nodes using SCP.

This package contains the Corosync Cluster Engine Executive, several
default APIs and libraries, default configuration files, and an init
script.

CRM shell is a Pacemaker cluster resource manager command line
interface. It supports Pacemaker configuration, management, and
troubleshooting.

Kronosnet, often referred to as knet, is a network abstraction layer designed for High Availability use cases, where redundancy, security, fault tolerance and fast fail-over are the core requirements of your application.

It is under layer of corosync-3.0