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Main Chaos Engineering Tools

Litmus: A popular and well-supported open-source tool with many scenarios. It has a steep learning curve but offers a wide range of features.
Chaos Mesh/Chaos Blade: These tools offer most regular features but also have a steep learning curve.
Chaos Toolkit: An open-source project that comes with a suite of standard chaos experiments, good introductory documentation, and supports most major cloud providers. It establishes a declarative API and makes it easy to code chaos experiments.

Gremlin: A commercial offering with a straightforward and intuitive setup. It is a proper commercial offering for chaos engineering.

AWS Fault Injection Simulator and AWS Resilience Hub: These tools are created to be used only in AWS cloud environments.
Azure Chaos Studio: Specifically designed for use in Azure cloud environments.