The goal of crary is to do one thing and one thing well: implement an HTTP server. It isn't constrained to rails--it doesn't even need roads. Its small enough to fit in your pocket and go with you wherever your journey takes you.
The intention is that its small enough and flexible enough to be used for most any HTTP server need. While it isn't a stand-alone system, nor does it have its own web-framework, these things can easily be built on top of crary. Crary should be easily embedded into the release of a larger application to provide a web interface or to create a web service interface.
The name crary is in honor of the inventor of the modern brick making machine, John Williamson Crary Sr. US Patents Nos. 21,186 and 67,728. Before Crary's invention bricks were formed by hand and of inconsistent dimensions/quality.