The Finite Element ToolKit (FETK) is a collaboratively developed, evolving collection of adaptive finite element method (AFEM) software libraries and tools for solving coupled systems of nonlinear geometric partial differential equations (PDE). The FETK libraries and tools are written in an object-oriented form of ANSI-C and in C++, and include a common portability layer (MALOC) for all of FETK, a collection of standard numerical libraries (PUNC), a stand-alone high-quality surface and volume simplex mesh generator (GAMer), a stand-alone networked polygon display tool (SG), a general nonlinear finite element modeling kernel (MC), and a MATLAB toolkit (MCLite) for protyping finite element methods and examining simplex meshes using MATLAB. The entire FETK Suite of tools is highly portable (from iPhone to Blue Gene/L), thanks to use of a small abstraction layer (MALOC) and heavy use of the GNU Autoconf infrastructure.

The FETK libraries and tools are developed collaboratively by a number of people, and are released freely under open source licenses for maximal benefit to the mathematics, science, and engineering communities. The FETK project lead is Professor Michael Holst at the Center for Computational Mathematics at UC San Diego.

The primary FETK ANSI-C software libraries are:

• MALOC is a Minimal Abstraction Layer for Object-oriented C/C++ programs.
• PUNC is Portable Understructure for Numerical Computing (requires MALOC).
• GAMer is a Geometry-preserving Adaptive MeshER (requires MALOC).
• SG is a Socket Graphics tool for displaying polygons (requires MALOC).
• MC is a 2D/3D AFEM code for nonlinear geometric PDE (requires MALOC; optionally uses PUNC+GAMER+SG).

• GPDE is a Geometric Partial Differential Equation solver (requires MALOC+PUNC+MC; optionally uses GAMER+SG).
• APBS is an Adaptive Poisson-Boltzmann Equation Solver (requires MALOC+PUNC+MC; optionally uses GAMER+SG).
• SMOL is a Smoluchowki Equation Solver solver (requires MALOC+PUNC+MC; optionally uses GAMER+SG).

• MCLite is a simple 2D MATLAB version of MC designed for teaching.
• FEtkLAB is a sophisticated 2D MATLAB adaptive PDE solver built on top of MCLite.

• PMG is a Parallel Algebraic MultiGrid code for general semilinear elliptic equatons.
• CgCode is a package of Conjugate gradient Codes for large sparse linear systems.