Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
GNS3 - GNS3 is a graphical network simulator that allows simulation of complex networks.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
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.
Google Cloud Functions - A serverless platform for building event-based microservices.
ns-3 - a discrete-event network simulator for internet systems