pyNastran: Nastran File Reader/Editor

pyNastran is an open-source Python library for reading, editing, and writing Nastran BDF, OP2, OP4, and F06 files, commonly used in finite element analysis (FEA). It supports various Nastran versions and provides tools for visualizing and manipulating FEA data. The library is actively maintained, with version 1.4.1 being the latest stable release and a consistent release cadence.