As might be expected with the rising popularity of the topic there is a huge amount of useful information on Graph Databases to be found on Wikipedia. This includes some highly informative tables of most, if not all, the popular Graph Database types as well as comparisons of their functionality and APIs. This alone makes it a very valuable resource for anybody contemplating developing a Graph Database for a project and wishing to make an informed choice. Wikipedia also notes that Neo4J is the most popular and widely deployed Graph Database, a point the snap shot illustration below listing types of deployment by well-known companies makes clear, as well as showing the level of interest by major Enterprises.

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