CryEngine is an engine designed by expert developers and delivers tools that other engines do not exactly have right off the start. It is one of the most powerful engines out there available for free. Also 5% royalty applies when you ship your project. Your first $5K annual revenue per project is royalty-free. So it is great for a first time project. Review collected by and hosted on G2.com.

It is not as intuitive as Unity or Unreal but they do have a very accessible knowledge base and tutorials to get started. They may not have as many tools and assets available on their store as other engines but have enough for any project to get started. Review collected by and hosted on G2.com.