Rhino (powered by Gravity API) is a new/old concept which allows to automate manual tests. Rhino utilizes a special freestyle language of manual tests and uses a sophisticated engine to understand and automate these tests.
Much like other well known spec based languages as Gherkin, each test case is actually a spec which Rhino engine can understand. Unlike other spec based languages, Rhino does not requires you to implement the back-end actions of each spec line as you would have otherwise.
Rhino API Standalone agent. You can connect your application or Application Lifecycle Manager (i.e., Jira, Azure DevOps, etc.) to Rhino and execute Rhino Specs.