News: The new release of Marvelous Designer 9.

Read more at the official webpage.
You have a good intro on youtube channel:

CodePen: Include shadertoy example in the webpage.

This issue can be solve it easy.
You need to get the iframe share from you shadertoy example.
Then use my example HTML and CSS from my codepen example.
You can remove the javascript code from example.
This javascript code is used to show the formula of sphere. I used my shadertoy example named Ray Marching - 001.

Blockly for young programmers.

Blockly is an open source library that makes it easy to add block based visual programming to an app, see the official webpage.
This tool has a good graphics and one great design to understand the flow of programming issue.
This project is good for kids and teenagers to start programming and see the source code into programming languages.
For example, the program build with this tool can be convert into programming language like: Java Script, Python, PHP, Lua and Dart.
You can see a simple video tutorial from the official Google Developers Youtube channel:

Chrome App : Marmoset tool.

The Marmoset is a Chrome App which lets you create gorgeous code snapshots.
This video tutorial let you see how can be used:

The YouiDraw online tool.

This online tool named YouiDraw is a good tool for graphics and design artists.
You can be found at the official website.
You can use 240 most popular Google Fonts were added into YouiDraw web apps with they all styles.
This tool comes with: Drawing, Logo Creator and Painter online tool.
I like the YouiDraw Logo Creator tool.

You can use it free or you can pay for extra features, like export SVG format :

• Free Start Trial for free ;
• Monthly Plan $9.99/mo;
• Yearly Plan $99.99/yr

Many tutorials can be found at YouTube channel.

Ultimate CSS Gradient Editor online tool.

The Ultimate CSS Gradient Editor was created by Alex Sirota (iosart) for creating CSS source code for many known browsers.
The tool is easy to use, just select the gradient or create a new one.
Add all parameters for positions, colors or from an image and you see in the right side of the screen the preview and source code.
Added support for 4 new gradient formats:

• IE 10+;
• Newer Webkit;
• Opera 11.10+;
• W3C;

This online tool has good browser compatibility.
You can test this online tool at this webpage.