p5.js is a JavaScript library that starts with the original goal of Processing, to make coding accessible for artists, designers, educators, and beginners, and reinterprets this for today's web.Using the original metaphor of a software sketchbook, p5.js has a full set of drawing functionality. However, you're not limited to your drawing canvas, you can think of your whole browser page as your sketch! For this, p5.js has addon libraries that make it easy to interact with other HTML5 objects, including text, input, video, webcam, and sound.

p5 - JS client-side library for creating graphic and interactive experiences, based on the core principles of Processing

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.And then access the contents via the URL of the web-site.

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.

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

Krita is a free and open source digital painting application. It is for artists who want to create professional work from start to end. Krita is used by comic book artists, illustrators, concept artists, matte and texture painters and in the digital VFX industry. 
 
Krita has over 100 professionally made brushes that come preloaded, Built-in vector tools help you create comic panels, Also comes with vector, filter, group, and file layers. Combine, order, and flatten layers to help your artwork stay organized. The Assistant Tool comes with 9 unique assistants to help you make that perfect shape. These tools range from drawing ellipses to creating curvilinear perspective with the Fisheye Point tool. 
 
If you create some brushes that you love, share them with the world by creating your own bundles. Krita supports full color management through LCMS for ICC and OpenColor IO for EXR, allowing you to incorporate Krita into your existing color management pipeline.

Krita is a free and open source digital painting application. It is for artists who want to create professional work from start to end. Krita is used by comic book artists, illustrators, concept artists, matte and texture painters and in the digital VFX industry. 

 Krita - Digital painting application

Inkscape is a vector graphics editor, with capabilities similar to Illustrator, CorelDraw, or Xara X, using the W3C standard Scalable Vector Graphics (SVG) file format. It supports many advanced SVG features (markers, clones, alpha blending, etc.) and great care is taken in designing a streamlined interface. It is very easy to edit nodes, perform complex path operations, trace bitmaps and much more.

Inkscape - Vector Graphics Editor

GIMP is the GNU Image Manipulation Program. It has many capabilities. It can be used as a simple Paint program, with full suite of painting tools including Brush, Pencil, Airbrush, Clone, etc.  It supports Photo Enhancement, Digital Retouching, Image format converter, Animation etc.

Gimp - GNU Image Manipulation Program, A photoshop alternative

ImageSharp is a new, fully featured, fully managed, cross-platform, 2D graphics API. Without the use of System.Drawing we have been able to develop something much more flexible, easier to code against, and much, much less prone to memory leaks. Gone are system-wide process-locks; ImageSharp images are thread-safe and fully supported in web environments. Built against .Net Standard 1.1 ImageSharp can be used in device, cloud, and embedded/IoT scenarios.

ImageSharp - A cross-platform library for the processing of image files; written in 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.

FreeCAD - An Open Source parametric 3D CAD modeler

An open-source creative-coding toolkit for Rust. Nannou is a collection of code aimed at making it easy for artists to express themselves with simple, fast, reliable, portable code. Whether working on a 12-month laser installation or a 5 minute sketch, this framework aims to give artists easy access to the tools they need.
 
Nannou aims to give equal priority to a full suite of creative I/O including graphics, multi-windowing, audio, lasers, lighting and more.

An open-source creative-coding toolkit for Rust. Nannou is a collection of code aimed at making it easy for artists to express themselves with simple, fast, reliable, portable code. Whether working on a 12-month laser installation or a 5 minute sketch, this framework aims to give artists easy access to the tools they need.

Nannou - A Creative Coding Framework for Rust

tldraw is a tiny little drawing app. It helps to Draw diagram, Create flow charts. Entire app can be used as a react component. Diagram can be exported to SVG, PNG, JPG, WEBP.

tldraw - A tiny little drawing app.

Archimedes is a free and open source CAD (Computer Aided Design) software. It is a robust system built over Eclipse's Rich Client Platform fully based on plug ins. This means it is easily extensible but also has a pretty thin core that allows you to select the features you need and drop the other ones easily. 

Archimedes: The open CAD

OpenSCAD is software for creating solid 3D CAD models. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies.
 
OpenSCAD is not an interactive modeller. Instead it is something like a 3D-compiler that reads in a script file that describes the object and renders the 3D model from this script file. This gives you (the designer) full control over the modelling process and enables you to easily change any step in the modelling process or make designs that are defined by configurable parameters.
 
OpenSCAD provides two main modelling techniques: First there is constructive solid geometry (aka CSG) and second there is extrusion of 2D outlines. Autocad DXF files can be used as the data exchange format for such 2D outlines. In addition to 2D paths for extrusion it is also possible to read design parameters from DXF files. Besides DXF files OpenSCAD can read and create 3D models in the STL and OFF file formats.

OpenSCAD is software for creating solid 3D CAD models. Unlike most free software for creating 3D models (such as Blender) it does not focus on the artistic aspects of 3D modelling but instead on the CAD aspects. Thus it might be the application you are looking for when you are planning to create 3D models of machine parts but pretty sure is not what you are looking for when you are more interested in creating computer-animated movies.

Openscad - The Programmers Solid 3D CAD Modeller

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.

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

MyPaint is a simple drawing and painting program that works well with Wacom-style graphics tablets. Its main features are a highly configurable brush engine, speed, and a fullscreen mode which allows artists to fully immerse themselves in their work.

 MyPaint - Simple drawing and painting program

Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Animations made with Pencil can be exported as QuickTime. <img src="/AppImages/Article/pencil-01.png" alt="" class="float-center">

Pencil is an animation/drawing software for Mac OS X, Windows, and Linux. It lets you create traditional hand-drawn animation (cartoon) using both bitmap and vector graphics. Animations made with Pencil can be exported as QuickTime.

Pencil - Animation and Drawing software

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. 
Its features include: 
<ul>
<li>Layers</li>
<li>Blocks (grouping)</li>
<li>35 CAD fonts included</li>
<li>Support for TrueType fonts</li>
<li>Various Metrical and Imperial units</li>
<li>DXF and DWG input and output</li>
<li>Printing to scale</li>
<li>Printing on multiple pages</li>
<li>Over 40 construction tools</li>
<li>Over 20 modification tools</li>
<li>Construction and modification of points, lines, arcs, circles, ellipses, splines, polylines, texts, dimensions, hatches, fills, raster images</li>
<li>Various powerful entity selection tools</li>
<li>Object snaps</li>
<li>Measuring tools</li>
<li>Part library with over 4800 CAD parts</li>
<li>Very complete and extremely powerful ECMAScript scripting interface</li>
</ul>

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. 

QCAD - Crossplatform CAD Solution

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