This is a Sinatra app that provides a UI and canned queries for El Dorado, an enterprise structure warehouse. The web user can retreive results from a menu of queries or author new ad-hoc queries interactively. Results are in the form of tables or diagrams both of which can hyperlink to related queries.
github 
Queries are written in Neo4j's Cypher language. Tabular results are then optionally rendered by template expansion into Graphviz's Dot language and displayed as SVG. Modeling conventions support tracing relations to their ETL source, but the graph database is not otherwise restricted.
See Database Build with ETL scripts.