The Grizzly OSGi HTTP Service Gitorial provides a walkthrough for creating an HTTP service using Grizzly, a Java framework optimized for the NIO API. It draws inspiration from tutorials like the Clojure Gitorial and Ramaze by Example, aiming to guide developers through the process effectively. The project, hosted on GitHub, showcases the contributions of user @neotyk, with Chris Wanstrath, known as @defunkt, acknowledging their work.