Graph platform for mind/knowledge mapping

Please, please be patient, it's my first time with neo4j. I'm looking for a graph platform for mind/Knowledge mapping. Something more powerful than a simple mind map software because if in a hand I must enrich properties of nodes with a lot of multimedia information or links, in the other I need to do net analysis and visual-synthetic synthesis.
Can someone help me? Something implemented on neo4j?

Thank a lot in advance

Recently, I met a Neo4j contributor in United States. He's running a company that does precisely that. It's called Graph-Commons ( You can check it out. It's all Neo4j under the hood.

This is a perfect platform to collaborate on. But I can't find their code? They seem to have enslaved their software? Liberty lost...