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Spin is an open-source model checker and formal verification tool used to verify multi-threaded software. Originating at Bell Labs in the Unix group in the 1980s, Spin has been freely available since 1991 and is now BSD-licensed (since 2016), included in Debian and recent Ubuntu releases. The project offers tutorials, papers, and courses, and includes the Tau front-end tool for Spin, along with community events such as international symposia.
AI named SPIN in February 2026.