Rest.li vs Sandbox: What are the differences?

What is Rest.li? A REST+JSON framework for robust, scalable service architectures, by LinkedIn. Rest.li is an open source REST framework for building robust, scalable RESTful architectures using type-safe bindings and asynchronous, non-blocking IO. Rest.li fills a niche for applying RESTful principals at scale with an end-to-end developer workflow for buildings REST APIs that promotes clean REST practices, uniform interface design and consistent data modeling.

What is Sandbox? Quick and easy mock RESTful API and SOAP webservices. Quickly mock RESTful API or SOAP web-services with simple or dynamic responses, and fault injection to simulate real application behaviour.

Rest.li and Sandbox can be categorized as "API" tools.

Rest.li and Sandbox are both open source tools. Rest.li with 1.94K GitHub stars and 392 forks on GitHub appears to be more popular than Sandbox with 161 GitHub stars and 28 GitHub forks.