This language/framework was included in this edition of the Radar for visibility. We felt that there wasn't anything substantial to add to the discourse around it, but that it was important to keep this in view.
Gremlin is an imperative graph traversal language supported by multiple graph databases. Its concise constructs can be used in place of the native language of the database, leading to faster development times and, in some cases, faster execution. We recommend its use as a good alternative in simple scenarios.