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Google Developer Portal - Everything you need to build better apps.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
i-DOCS - Get the latest Microsoft documentation for end users, developers and IT professionals: API reference, code examples, technical documentation, and more.
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.
AWS Self-Paced Labs - Self-paced training labs help you test products and gain practical experience working with AWS - learn on-demand at your own pace.
ns-3 - a discrete-event network simulator for internet systems