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XTrackCAD is a open-source, free, CAD program for designing model railroad layouts. You can easily create layout of any scale or size. Libraries for many brands, scales and gauges of track and turnouts/points and model structures are included. Adding new components is easy with the built-in editor. It runs on Windows, Mac and Linux,
ThanCad is a 2dimensional cad, with limited 3d support and raster inclusion capability and emphasis in engineering. It is being written in Python and since it uses the Tkinter library, it is platform independent.
Draw vector graphics to scale using a descriptive language
Drawj2d creates technical line drawings using a descriptive language. It writes pdf, svg, eps, emf and dxf vector graphics or png images. It runs on all platforms that run Java. It is inspired by Asymptote but with a tcl-like syntax and 2D only.
JDrafting is an open source Java application to create Technical Drawing exercises.
This application is inspired by the 'Classical Construction', also known as 'Ruler-and-compass Construction' or 'Compass-and-straightedge construction'. However, another drawing tools can be used.
(More info about classical construction: https://en.wikipedia.org/w/index.php?title=Compass-and-straightedge_construction)
Download examples in 'Files tab'
JRE 8+...
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Sailcut CAD is a sail design and plotting software. It allows you to design and visualise your own sail and compute the accurate development of all panels in flat sheets.
QCAD is an application for computer aided drafting (CAD) in two dimensions (2D). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams. QCAD works on Windows, Mac OS X and many Linux and Unix Systems.
program for design cad 2D (next 3D), with possibility to manage plans, to print. The program is multiplatform and multilanguage. It allows to realize plans buildings, or mechanics.
A parametric, feature-based, sketch-driven 3D CAD application, built around a geometrical constraint solving engine. Project is in early development stage. The FreeSG library (http://freesg.org/) is required.
QtOPENCASCADE is a framework for integrating the OpenCascade Solids Modelling library with the Qt4 toolkit to enable the development of multi-platform CAD and CAE applications.
CamSketchpad is a modern recreation of Ivan Sutherland's seminal Sketchpad program. It's a 2D drawing / CAD program with support for geometrical constraints and the inclusion of instances referencing other drawings.
A CAD/painting program written in PHP. The user requires no detailed drawing skill. All objects are functions placed on the screen by defining one or two points with parameters for the object. Produces .png-.jpg-.gif(animated)-.mpg-.pov pictures. See Hom
Adage is an advanced graphics packagecombining simplicity with CAD/CAGD power. It comprises a Gtk frontend and an extensible graphics engine based on the MDAG programming system.
JCad is a project to create a fully function 2D CAD program written entirely in Java.
It\\\'s Purpose is to create a cross platform smart 2D CAD program with Java2D/Swing.