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CakePHP: The Rapid Development Framework for PHP - Official Repository
node.js REST framework specifically meant for web service APIs
HTTPie + prompt_toolkit = an interactive command-line HTTP client featuring autocomplete and syntax highlighting
Microsoft REST API Guidelines
swagger-codegen contains a template-driven engine to generate documentation, API clients and server stubs in different languages by parsing your OpenAPI / Swagger definition.
Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API
Apereo CAS - Enterprise Single Sign On for all earthlings and beyond.
The Grails Web Application Framework
Swagger module for node.js
Java DSL for easy testing of REST services