ImplicitCAD - A math-inspired CAD program in haskell. CSG, bevels, and shells; 2D & 3D; gcode generation

•    Haskell

ImplicitCAD is a programmatic CAD program, implemented in haskell. Unlike traditional CAD programs, programmatic CAD programs use text descriptions of objects, as in programming. Concepts like variables, control structures and abstraction are used, just as in programming. Generally, objects in programmatic CAD are built with Constructive Solid Geometry or CSG. Unions, intersections and differences of simpler shapes slowly build the object. ImplicitCAD supports all this and much more.

FreeCAD - An Open Source parametric 3D CAD modeler

•    C++

FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. FreeCAD is based on OpenCASCADE, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API.

QCAD - Crossplatform CAD Solution

•    C++

QCAD is an application for computer aided drafting in two dimensions (2d). With QCAD you can create technical drawings such as plans for buildings, interiors, mechanical parts or schematics and diagrams.

OpenJSCAD - Set of modular, browser and command line tools for creating parametric 2D & 3D designs with Javascript

•    Javascript

OpenJsCad.org is a more up-to-date OpenJsCAD frontend where you can edit .jscad files either locally or online via JS editor (built-in). A few functions are available to make the transition from OpenSCAD to OpenJSCAD easier (scad-api built-in), as well CLI (command-line interface) for server-side computations with NodeJS.

Librecad - Open Source 2D-CAD

•    C++

LibreCAD is a comprehensive, 2D CAD application based on the community edition of QCad. It is available in more than 20 languages. LibreCAD has been re-structured and ported to qt4 and works natively cross platform between OSX, Windows and Linux.

ArgoUML - UML modeling tool

•    Java

ArgoUML is the leading open source UML modeling tool and includes support for all standard UML 1.4 diagrams. It supports Class diagram, Statechart diagram, Activity diagram, Use Case diagram, Collaboration diagram, Deployment diagram and Sequence diagram. The diagram could be exported to GIF, PNG, PS, EPS, PGML and SVG. It generates code for Java, C++, C# and PHP. It also supports reverse engineering, generates code from diagram.

StarUML - UML or MDA Platform

•    Delphi

StarUML is a software modeling tool to develop fast, flexible, extensible, featureful UML/MDA platform running on Win32 platform. It is a good alternative to Rational Rose. StarUML provides simple and powerful plug-in architecture so anyone can develop plug-in modules in COM-compatible languages.

Green - Create UML diagram from code

•    Java

green is a LIVE round-tripping editor, meaning that it supports both software engineering and reverse engineering. You can use green to create a UML class diagram from code, or to generate code by drawing a class diagram. green supports exporting files to both jpg and gif format, so that you can share you diagrams without any issues!

ModelGoon - UML for Java

•    Java

ModelGoon provides support to create UML diagram from Java source. It provides support to build packages dependencies diagram, Class Diagram from existing sources, Build Sequence Diagram from a Java method, Shows the dependencies between user selected packages and lot more. ModelGoon is not a UML modeler, but just an UML point of view above the Java source code. It still uses UMLet for drawing purpose and the Eclipse Modeling Tools for implementing full MDA platforms.

Mermaid - Generation of diagram and flowchart from text in a similar manner as markdown

•    Javascript

Generation of diagrams and flowcharts from text in a similar manner as markdown. Ever wanted to simplify documentation and avoid heavy tools like Visio when explaining your code? This is why mermaid was born, a simple markdown-like script language for generating charts from text via javascript.

CAD Kernel

This is a highly efficient very simple cad engine written in .NET. It offers simple parametrical modelling including some predefined solid objects, surfaces and curves. It provides a library of CAD computationally geometry objects like BSpline Curves, BSpline Surfaces, Bezie...

[C#] UML Touch

This project is my master thesis project for Msc Software Engineering at Oxford Brookes univesity. The goal of this project is to develop a UML Editor, where users can draw their diagram directly on the screen and process it into proper computer diagram using sketch recognition.

Eclipse Model Development Tools

•    Java

The Model Development Tools (MDT) project provide exemplary tools for developing models based on those metamodels. It supports creating UML diagram, Reverse engineer UML diagram from code, and lot more.

wavedrom - :ocean: Digital timing diagram rendering engine

•    Javascript

WaveDrom is a Free and Open Source online digital timing diagram (waveform) rendering engine that uses javascript, HTML5 and SVG to convert a WaveJSON input text description into SVG vector graphics. WaveJSON is an application of the JSON format. The purpose of WaveJSON is to provide a compact exchange format for digital timing diagrams utilized by digital HW / IC engineers.

Diagram Ring

Advanced diagram editor for Flowcharts, Class Diagrams, DFDs, ERDs, Pie charts, Bar charts and etc. It's been developed in WPF , C#

react-lifecycle-methods-diagram - Interactive React Lifecycle Methods diagram.

•    Javascript

An interactive version of React Lifecycle Methods diagram tweeted by Dan Abramov. Built in React, obviously. I did my best to make the diagram fully accessibile, both for keyboard navigation and screen readers for visually impaired people.

Dia - Visio alternative

•    GTK+

Dia is inspired by the commercial Windows program Visio, though more geared towards informal diagrams for casual use. It can be used to draw many different kinds of diagrams. It currently has special objects to help draw entity relationship diagrams, UML diagrams, flowcharts, network diagrams, and many other diagrams. It is also possible to add support for new shapes by writing simple XML files, using a subset of SVG to draw the shape.

KoSMos

An Open Source Solid Modelling Kernel based upon a relational database such as e.g. MySQL. KoSMos will implement the geometry and topology operations of a modern, full featured solid modelling kernel.

Open Diagram

Open Diagram is the definitive open source .net diagramming component library for the .Net framework winforms environment. Use Open Diagram to add interactive data visualizations to your .net applications.

Circuit Diagram

•    CSharp

Circuit Diagram enables you to make electronic circuit diagrams and export them as images.