There are a lot of systems that Neo4j integrates with, from other databases, data processing solutions like Spark, data visualization tools and libraries and ETL and Reporting tools.
Please ask in the appropriate sub-category, and only post in #integrations if none of them fits. In case there is lots of interest, we can create new sub-categories.
There is a lot of information available on Neo4j integrations:
More details in the individual sub-categories.