FEYNRules 2.0 is a Mathematica-based package that enables the implementation of particle physics models into high-energy physics tools. It calculates Feynman rules from a model's Lagrangian and outputs them in a format suitable for programs like CALCHEP, FEYNARTS, MADGRAPH, SHERPA, and WHIZARD. Since its initial release, FEYNRules has been enhanced with features such as support for two-component fermions, spin-3/2 and spin-2 fields, superspace notation, automatic mass diagonalization, and interfaces for various Monte Carlo programs. These improvements allow models to be quickly and accurately translated from theory to simulation and experimental comparison. The package supports a wide range of models, including those with spin-3/2 particles, supersymmetric models, and complex mass matrices. It includes a superspace module for implementing SUSY models, an automatic mass diagonalization module, and interfaces for generating code for Feynman diagram calculators. FEYNRules also provides a universal output interface (UFO) for models, which is supported by several Monte Carlo programs. Additionally, it includes a new interface for WHIZARD, which automatically generates gauge model files. FEYNRules also includes a module for automatically computing 1→2 decay widths and has improved speed and efficiency. It provides guidelines for model implementation and a web-based validation platform to ensure model accuracy. The package is designed to be user-friendly, allowing users to define models with a single unified syntax, and it supports various indices and field types, including those for supersymmetric models and tensorial parameters. The package is structured to allow users to define model parameters, particle classes, and gauge groups, with detailed options for specifying field properties, charges, and interactions. It supports both scalar and tensorial parameters, as well as complex and real parameters. The package also includes features for handling ghost fields, Majorana fermions, and Weyl fermions, with options for specifying chirality and phase information. Overall, FEYNRules 2.0 is a comprehensive tool for tree-level phenomenology, enabling the efficient and accurate implementation of particle physics models into simulation software for comparison with experimental data.FEYNRules 2.0 is a Mathematica-based package that enables the implementation of particle physics models into high-energy physics tools. It calculates Feynman rules from a model's Lagrangian and outputs them in a format suitable for programs like CALCHEP, FEYNARTS, MADGRAPH, SHERPA, and WHIZARD. Since its initial release, FEYNRules has been enhanced with features such as support for two-component fermions, spin-3/2 and spin-2 fields, superspace notation, automatic mass diagonalization, and interfaces for various Monte Carlo programs. These improvements allow models to be quickly and accurately translated from theory to simulation and experimental comparison. The package supports a wide range of models, including those with spin-3/2 particles, supersymmetric models, and complex mass matrices. It includes a superspace module for implementing SUSY models, an automatic mass diagonalization module, and interfaces for generating code for Feynman diagram calculators. FEYNRules also provides a universal output interface (UFO) for models, which is supported by several Monte Carlo programs. Additionally, it includes a new interface for WHIZARD, which automatically generates gauge model files. FEYNRules also includes a module for automatically computing 1→2 decay widths and has improved speed and efficiency. It provides guidelines for model implementation and a web-based validation platform to ensure model accuracy. The package is designed to be user-friendly, allowing users to define models with a single unified syntax, and it supports various indices and field types, including those for supersymmetric models and tensorial parameters. The package is structured to allow users to define model parameters, particle classes, and gauge groups, with detailed options for specifying field properties, charges, and interactions. It supports both scalar and tensorial parameters, as well as complex and real parameters. The package also includes features for handling ghost fields, Majorana fermions, and Weyl fermions, with options for specifying chirality and phase information. Overall, FEYNRules 2.0 is a comprehensive tool for tree-level phenomenology, enabling the efficient and accurate implementation of particle physics models into simulation software for comparison with experimental data.