Tools for aircraft 3D concept creation & aerodynamic analyze of 3D models:
- PANUKL (can export 3D models) - http://www.meil.pw.edu.pl/add/ADD/Teach ... are/PANUKL
- SDSA - http://www.meil.pw.edu.pl/add/ADD/Teach ... tware/SDSA
- DACPEI (support FSX formats) - http://sourceforge.net/projects/dacpei
Tools for aircraft 3D model design:
- PolygonCrest (support YSFlight formats) - viewtopic.php?t=6374
- Blender (+plugins)- http://blender.org
- Sketch Up (+plugins)
- FreeCAD (+plugins) - http://freecadweb.org
- SolveSpace (export to DXF, OBJ, STEP, STL, SVG) - http://solvespace.com
Tools for aircraft 2D concept design (with support for DXF, SVG):
- LibreCAD (forked from QCAD) - http://librecad.org
- QCAD (DWG support) - http://qcad.org
- Inkscape (vector SVG editor) - http://inkscape.org
Tools for convert aircraft models between different flight simulators.
- Blender scripts (for all simulators) - viewtopic.php?f=147&t=8098&p=91358#p91358
- ...
Online & browser-based tools (HTML5+JS)
- SVG-Edit (vector) - https://github.com/SVG-Edit
- WebCAD (2D)- https://github.com/zengfenfei/WebCAD
(tools on Russian - http://webcad.pro/ ) - OpenJSCAD (3D) - https://github.com/Spiritdude/OpenJSCAD.org
If You know any other or new apps, that are free and used for aircraft 3D design let me know!
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P.S.: This topic in active updating.
REFERENCES:
1) http://www.meil.pw.edu.pl/add/ADD/Teach ... aft-Design
2) http://aircraft-design-software.experim ... esign.html
3) http://shoh5556.tumblr.com/
Bonus - Free Cadblocks - Aircrafts