Based on our record, Cisco VIRL seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Just found out my own answer. It is the new version of VIRL stated here: https://learningnetwork.cisco.com/s/virl. Source: about 3 years ago
FlexSim - Simulation software to model, simulate, predict, and visualize systems in manufacturing, material handling, healthcare, warehousing, mining, etc.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
ns-3 - a discrete-event network simulator for internet systems
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Paessler Multi Server Simulator - Paessler Multi Server Simulator is inexpensive and robust software that helps you power massive-scale testing.
Google Cloud Functions - A serverless platform for building event-based microservices.