For extremely large deformation problems in solid mechanics, the Lagrangian finite element approach is often ineffective. Galerkin meshfree methods developed extensively over the past twenty years and are sufficiently mature to handle simulations involving large deformations with relative ease. Many state-of-the-art advances in these methods have been implemented into a research code called Meshfree Explicit Galerkin Analysis(MEGA) at The Pennsylvania State University. The code has been validated and verified against both linear and nonlinear mechanics benchmark solutions.