As a follow-up to the challenge set forth by (Pastusek et al, 2019) to create an open-source drilling community for modelling and data, this paper presents the charter, contribution methods, workflows, and interoperability standards of the open source drillstring modelling community. A series of examples, ranging from simple drillstring and fluids models to coupled drillstring dynamics models are included. They demonstrate the coding styles, validation, and verification necessary to submit a model to the repository. These models include a torsional drillstring model, a coupled axial-torsional drillstring dynamics model with integrated control system responses, an advanced fluid model for drilling fluids, and a bottomhole assembly dynamics model. The drillstring modelling and overall optimization communities are invited to make use of these models and contribute their own to create an active ecosystem that promotes progress.

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