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MeshLab is an open source, portable, and extensible system for the processing and editing of unstructured 3D triangular meshes. The system is aimed to help the processing of the typical not-so-small unstructured models arising in 3D scanning, providing a set of tools for editing, cleaning, healing, inspecting, rendering and converting this kind of meshes.

Elmer - Open Source Finite Element Software for Multiphysical Problems. Elmer is an open source multiphysical simulation software mainly developed by CSC - IT Center for Science (CSC). Elmer development was started 1995 in collaboration with Finnish Universities, research institutes and industry. After it's open source publication in 2005, the use and development of Elmer has become international. Elmer includes physical models of fluid dynamics, structural mechanics, electromagnetics, heat transfer and acoustics, for example. These are described by partial differential equations which Elmer solves by the Finite Element Method (FEM).

pdnMesh: A finite element program ================================= Copyright (C) 2001-2005 Sarod Yatawatta pdnMesh is a program that can solve 2D potential problems (Poisson Equation) and eigenvalue problems (Helmholtz Equation) using the Finite Element Method. Common applications occur in electromagnetics, heat flow and fluid dynamics. It can solve problems using both Nodal Based Formulation and Edge Based (Vector) Formulation. The features of the program are as follows. * Automatic mesh generation according to given boundaries. * Adaptive and Interactive mesh refinement. * Problem solution using Cholesky Decomposition or Conjugate Gradient Method with sparse storage. * Eigenvalue solution using LAPACK. * (Optionally) Eigenvalue solution using QR iteration with shifts. * Generating plots of contours, mesh and gradient on screen. * Generating Encapsulated Postscript plots of contours and mesh. * Generating a data file of the mesh to be used by other solvers. * Can import DXF files generated by CAD programs. * GUI is available with glut and GTK/GTKGLExt. Needs OpenGL.

Qfsm is a graphical editor for finite state machines written in C++ using Qt. Finite state machines are a model to describe complex objects or systems in terms of the states they may be in. In practice they can used to create regular expressions, scanners or other program code. Current features of Qfsm are: - Creation, editing, loading and saving of binary and ASCII machines - Drawing of states and transitions - Binary and ASCII condition codes - Setting of a start state and end states - Zooming - Cut, copy & paste inside Qfsm - Printing of diagrams - Multiple windows - Integrity check - Interactive simulation - AHDL/VHDL export - State table export (Latex, HTML)

SCEPTRE (System for Circuit Evaluation and Prediction of Transient Radiation Effects) is a general purpose circuit analysis program which provides all three major analyses, AC, DC, and transient analysis, on either linear or nonlinear networks. It employs a free-form input language and state variable methods to simulate problems of interest to electrical engineers.

The Quine-McCluskey Logic Simplifier is a utility written to simplify digital logic. You feed it a canonical decimal list and it does the rest.

TOCHNOG is a free finite element program with many features. TOCHNOG accepts free format input. Boundary conditions can be imposed at geometrical entities, as well as nodes and elements. Among the FE models supported are: differential equations (materials), convection-diffusion equations, Stokes and Navier-Stokes (fluids), elasticity (isotropy and transverse isotropy), plasticity (Von-Mises, Mohr-Coulomb, etc.; plastic surfaces can be arbitrarily combined). Residues in equations and error estimates for all data can be printed or plotted using gnuplot/plotmtv, CalculiX or gmsh. TOCHNOG supports a choice of description frames including Lagrangian, Eulerian and arbitrary Eulerian-Lagrangian (AEL).

VARKON can be used as a traditional CAD-system with drafting, modelling and visualization if you want to but the real power of VARKON is in parametric modelling and CAD applications development. VARKON includes interactive parametric modelling in 2D or 3D but also the unique MBS programming language integrated in the graphical environment. The system was originally developed by a group at the University of Linkoping in Sweden during 1984-86 under the leadership of Dr. Johan Kjellander who was then the president of Microform AB. From 1986 the system was owned, marketed and further developed by Microform AB.

What is Z88? Z88 is a fast, powerful and compact Finite Elements Analysis Program especially designed for PCs, workstations and large computers with UNIX and PCs with Windows XP/95. FEATURES # Z88 features 20 finite element types. # It covers plane stress, plate bending, axial symmetric structures and spacial structures up to 20-node Serendipity hexahedrons. # Comes with a user-friendly interface (the Z88 Commander). # Has a powerful mesh generator. # Features a DXF converter and two plot programs. # Contains the FEA solver featuring an in-situ Cholesky solver along with the Jennings storage method. # For large structures the new iteration solver is recommended. # The import of COSMOS and NASTRAN files from Pro/ENGINEER (with option Pro/MECHANICA) is possible.

Transcalc is an analysis and synthesis tool for calculating the electrical and physical properties of different kinds of RF and microwave transmission lines. Transcalc was somewhat inspired by the functionality of Agilent Technologies' commercial program linecalc. Transcalc aspires to be more functional in the long run and well-documented with appropriate references to formulas that are used. Transcalc is built using the GIMP toolkit (GTK) for its GUI interface. For each type of transmission line, using dialog boxes, you can enter values for the various parameters, and either calculate its electrical properties (analyze), or use the given electrical requirements to synthesize physical parameters of the required transmission line. Available transmission lines (this list will expand with subsequent releases): - Microstrip - Rectangular Waveguide - Coaxial Line - Coupled Microstrip