Cart3D is a high-fidelity inviscid analysis package for conceptual and preliminary aerodynamic design. It allows users to perform automated CFD analysis on complex geometry and supports steady and time-depedent simulations. The package features fully-integrated adjoint-driven mesh adaptation and also includes utilities for geometry import, surface modeling and intersection, mesh generation, and post-processing of results. The main flow solvers run in parallel using either shared memory (OpenMP) or distributed memory (MPI) with excellent scalability. The package is highly automated so that geometry acquisition, and mesh generation can usually be performed within a few minutes on most current desktop computers.