GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
Puppet Enterprise - Get started with Puppet Enterprise, or upgrade or expand.
ns-3 - a discrete-event network simulator for internet systems
Packer - Packer is an open-source software for creating identical machine images from a single source configuration.
NetSim - NetSim software was created to simulate various Cisco systems. Cisco software is known around the world as being one of the best network, routing and switch systems for businesses and private use. Read more about NetSim.
Terraform - Tool for building, changing, and versioning infrastructure safely and efficiently.