I started with an open-source project called Neo4jConnect that enables you to connect to Neo4j, which is a graph-database written in Java and accessible through the REST api. On this page you can find the several operations exposed by Neo4j through REST. Neo4jConnect exposes an object api to manipulate the graph database.
More information and a quickstart can be found on the project site.
In the next couple of weeks I will add more documentation and features!