cayleygraph/cayley ? reverse-engineered prompt

Build me an open source graph database called Cayley that can store and query linked data, with a simple web interface for browsing, querying, and visualizing the graph. I want it to feel like a real tool people can run locally or in production, with a built in query editor, a visualizer, and a REPL so I can explore data easily.

Support a few different ways to ask questions of the graph, including a Gremlin like query style, a GraphQL inspired query style, and a simpler Freebase style option. It should be modular enough that it can work with different back ends and be used from other programs too. Please make the default setup easy to start, include a sample configuration and example data, and keep the code clean and well tested. If anything is unclear, look up the current docs online and match the existing Cayley project style.