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An essay arguing that the true essence of object-oriented programming is messaging, not classes, and introducing the Abject project and Ask protocol as a revival of this idea adapted for AI.
JetBrains has open-sourced YouTrackDB, a general-use object-oriented graph database with features like O(1) link traversal, snapshot isolation, TinkerPop/Gremlin support, and a custom SQL-based query language YQL. It is used internally in production and is available under Apache 2.0.