The following are links to sites where software and related information is distributed for free or on a non-profit basis. Please suggest links or report broken ones here.

• CFD OnLine: resources, books and forums.
• XFOIL: subsonic airfoil development.
• UIUC Airfoil Data Site: Prof. Selig's airfoil data set and links.
• NACAGEN - NACA Foil Generation: generate NACA 4 and 5 digit foils.
• Accumeasure: sail shape analysis.
• PMARC12: computes the potential flow field around complex three-dimensional bodies.
• Carene: hull design.
• SailCut: sail design.
• Bio Design and Displacement: boat design.
• HullDrag/32: hull resistance calculation.
• Sail Analyzer: sail shape analysis.
• SailForm: 3D sail visualization and design.
• Hull Designer: 3D hull design.
• SailPowerCalc: sail force calculator.
• SailTrimSim: sail trim simulator.
• PHRF Calculator® - How Fast Is Your Boat?: calculates approximate average boat speed and seconds per mile speed differences.
• Lifting Line Analysis Spreadsheet: computes optimal planforms for wings, cat rig sails, and single hydrofoils.
• PABLO - Potential Flow Around Airfoils with Boundary Layer Coupled One-Way: by Christian Wauquiez.
• Software for Aerodynamics and Aircraft Design: Virginia Tech University.
• MICHELET: CFD demo version (with limitations), free.
• Sailboat Performance Calculator: by Jobst Vandrey.
• Sailboat Performance Calculator: by Mike Thomas.
• Sail Calculator: by Carl Adler.
• Mainsheet Load Calculator: by Joseph Oster.
• Ideal Boat Hull Calculator: by Joseph Oster.
• Maximum Hull Speed Calculator: by US Sailing.
• Plotfoil: plotting of airfoil sections.
• Hiroshi Takeuchi's NASG airfoil collection
• MASTstruct for Masthead Rigs: masthead rig scantlings, by ANT.
• MASTstruct for Fractional Rigs: fractional rig scantlings, by ANT.
• NACA 4 Digits Series: a profile generator by Jens Trapp and Robert Zores.
• NACA 5 Digits Series: a profile generator by Jens Trapp and Robert Zores.
• Profili 2: freeware-shareware software for wing airfoils managing, drawing, and analysis.
• MARNET CFD: is an EU Thematic Network covering all matters relating to the development and exploitation of Computational Fluid Dynamics (CFD) in the European maritime and offshore industries.

• XFLR5: an analysis tool for airfoils, wings and planes operating at low Reynolds Numbers.