Free drawing software for Windows, Mac OS X, and Linux
Dia Diagram Editor is free Open Source drawing software for Windows, Mac OS X and Linux. Dia supports more than 30 different diagram types like flowcharts, network diagrams, database models. More than a thousand readymade objects help to draw professional diagrams. Dia can read and write a number of different raster and vector image formats. Software developers and database specialists can use Dia as a CASE tool to generate code skeletons from their drawings. Dia can be scripted and extended using Python.
K-3D is the free (as in freedom) 3d modeling, animation, and rendering system.
Sodipodi is general vector illustrating application for Linux/Unix and Windows. It uses W3C SVG as native file and in-memory image format and can do many neat things.
The Doodle project aims to provide a language to easily describe Origami diagrams and produces a ready-to-print document. Doodle will free creators from diagramming constraints and increase their capability to share their creations.
AudioCarver is a music composition application featuring a user interface based on 3d modeling.
Convey is a real-time, online, multi-user collaboration tool which augments text, graphics, and symbols. Examples of graphics include shapes, mathematical expressions, diagrams, flow charts, and pictures.
Debrief is an Open Source Java application used for viewing maritime vessel tracks in 2 and 3 dimensions. Tracks are read in using a number of flat-file ASCII formats, including AUTEC (RAO), PMRF and AFWTF.
Varkon.Org is a resource site for users of the Varkon parametric CAD and modeling system. This site is a mirror and archive for the Varkon.Org site. You can find all versions of modules for use with Varkon on this mirror site. See the website for info.
A UML class diagram editor written in C++ using Tcl/Tk for the GUI portion. Designed to be easy to maintain and extend.
A library of 3-D tools for vector algebra. Already in wide use for 3 decades in crystallographic applications.