DAP  
   Preliminary new kitplane analysis that allows you to evaluate a new airplane, or performance changes resulting from modifications.
   http://www.angelfire.com/biz6/dapaero

Hanley Innovations  
   Aerodynamics and Airfoil Analysis Software for Windows. Test airfoils, eBooks about aerodynamics, plot airfoil sections for airplane constructions.
   http://www.hanleyinnovations.com/

Zona Technology  
   Advanced aeroelastic, aeroservoelastic, flutter and flight loads software products.
   http://www.zonatech.com

Public Domain Aerospace Software  
   Software for the Aerospace Engineer. Site has free sample downloads. CD for sale containing many useful programs, including Digital DATCOM.
   http://www.pdas.com

Flight Dynamics and Control Toolbox  
   Matlab/Simulink toolbox for flight simulation, flight dynamics research, and flight control system design. Free downloads of the toolbox and user-manual, including extensive background information.
   http://www.dutchroll.com/

Satellite Tool Kit  
   Analytical engine to calculate data and display multiple 2-D maps to visualize various time-dependent information for satellites and other space-related objects such as launch vehicles, missiles, and aircraft.
   http://www.stk.com/

Flight Gear Flight Simulator  
   Open Source flight simulator. Source code is available here, and it can run on Windows, Linux, Mac platforms.
   http://www.flightgear.org

Synaps  
   Offers a graphical analysis automation and numerical optimization framework. Allows engineers to couple their analysis codes without programming.
   http://www.synaps-inc.com

Xpatch  
   High-frequency radar signature analysis and prediction software.
   http://www.demaco.com/

International Aerospace  
   Supplies software tools and training for the space, intelligence and military communities.
   http://www.intaero.com

Diversified International Sciences Corporation  
   Specializing in Air Traffic Control (ATC) Services, Information Technology Services and the Atom System. Provides systems, services and consulting expertise.
   http://www.discmd.com/index.htm

DARcorporation  
   Airplane design, analysis & drafting Software. Also offers consultancy and testing services. List of references and clients. FAQ and evaluation programs.
   http://www.darcorp.com/

Supersonic wing simulator  
   A Java Applet that simulates the supersonic flow over a wing. To explore the quasi two-dimensional calculation of the supersonic flow over a wedge-shaped infinity-span wing.
   http://odin.prohosting.com/~evgenik1/wing.htm

Rotordynamics-Seal Research  
   Offers consulting in rotordynamics as well as seal and bearing analysis software for hydrostatic, hydrodynamic, foil, magnetic and rolling element bearings.
   http://www.rsr.com

Scientific Engineering Research  
   Offers programs for vibration analysis of non-linear rotor-bearing-foundation systems. By linearization in the vicinity of a stable equilibrium position or by direct solution of the non-linear differential equations of motion in the time domain. Detailed
   http://sci-e-research.com/tpak.html

FlightGear Flight Simulator  
   An open-source, multi-platform, cooperative flight simulator development project. Source code for the entire project is available and licensed under the GNU General Public License. The goal of the project is to create a sophisticated flight simulator fram
   http://flightgear.sourceforge.net/

ASTOS  
   The Aerospace Trajectory Optimization Software is a tool for solving launcher, reentry and orbit trajectory problems without any programming. ASTOS is a special aerospace model of GESOP, which solves optimization problems using SNOPT or SOCS.
   http://www.astos.de

RocFlight Rocket Trajectory Software  
   Windows based, planar rocket trajectory software for launch vehicles traveling through the standard earth atmospheric model. Includes a database of common high power/model rocket motors, an optimal mass calculation feature, and custom graphing capabiliti
   http://www.rocflight.com

UIUC Applied Aerodynamics Group  
   University of Illinois Urbana/Champagne, Aerospace Engineering Dept. web page. Has airfoil software, flight simulation software and aircraft models.
   http://www.aae.uiuc.edu/m-selig/

Aerospace Scientific  
   Specialises in the application of Artificial Intelligence to the space industry. Description of software and consultancy services offered.
   http://www.scientific.co.uk/aerospace/

JSBSim Flight Dynamics Model  
   A free, open source, multi-platform flight dynamics model written in C++. New aircraft models do not require additional code.
   http://jsbsim.sourceforge.net/