CalcForge is an open-source platform providing a range of engineering calculators and tools for structural, geotechnical, and tunneling analysis. With an extensive collection of calculators, users can analyze beams, frames, trusses, steel and concrete sections, calculate moments of inertia, and more. The platform is designed for engineers by engineers, supporting both customization and local deployment. Users can modify and contribute to the calculators, fostering a collaborative community to continuously improve and expand the toolset.