Below are free resources to teach you to code, design, and produce apps. They range from beginner coding sites to free tools that let you to create professional quality projects.

Block-Based Coding

SCRATCH from MIT a simple programming language w/a drag and drop interface. No programming experience required. Learn Java with SCRATCH! Ages 5-15 Online. No download necessary.

Scratch Projects each project page has helpful videos.

Code Studio teaches Computer Science fundamentals for all ages

Made w/ Code Inspirational videos and fun projects entice girls to start coding.

App Inventor Create an android mobile app in hours.

MIT App Inventor drag-and-drop app creation, make an app quickly.

Hour of Code resources.

KODU Game Lab Community build games, play games, share games (Make sure your computer meets the requirements before you download free from the Microsoft Store.)

KODU Resources scroll down to 'Self-Learning' for a class on game design
Kodu Projects each project page has helpful videos

Tynker from block coding to text-based coding: design games, build apps, mod Minecraft, and make incredible projects (Free account gives you access to some games/lessons.)

Text-Base Coding

Code Monkey online game lets you use text-based coding w/ puzzles that get quite challenging.

Tynker from block coding to text-based coding: design games, build apps, mod minecraft, and make incredible projects (Free account gives you access to some games/lessons.).

Best Coding Tools list of best tools for middle school.

Tutorials Point has online tutorials for dozens of languages, with online compilers, so you do not need more software to test your new programs. Do not miss the Video Lessons about EVERYTHING to do with Coding and Math.

Notepad++ if you write your own code, you need a plain text editor. This one can highlight syntax or auto-complete your code for 50+ languages.

Java Coding

Learn Java Skills has Java learning resources for students of all ages and abilities.

TKP Courses each free course has several videos to teach you Java.

Greenfoot Java -- a visual 3D educational software tool with a code editor to create games and simulation. Ages 13-15.

Download Greenfoot

Joy of Code video series talks you through installing Greenfoot Java and learning to program with it.

Alice Educational Software that teaches students programming in a 3D Environment. Ages 13+.

Download Alice Trouble? Read these installation instructions.

Alice Videos learn how to use this 3D programming tool to make videos, games, etc.

Website Coding

Code Academy online lessons in coding, starting w/ HTML and CSS for webpages.

w3schools.com will teach you most languages used in websites. It's also a great quick reference if you need to look up a command.

Notepad++ if you write your own code, you need a plain text editor. This one can highlight syntax or auto-complete your code for 50+ languages.

Graphics

Paint.net Free photo editing and image software for Windows. Compares to Adobe Photoshop and GIMP.

GIMP Free and Open source image manipulation program.

GIMP Tutorials each webpage walks you through using the many features of GIMP.

Blender 3D creation suite. It supports 3D modeling, rigging, animation, simulation, rendering, compositing and motion tracking, even video editing and game creation. Make movies. Make 3D models(characters) to use in other programs (like Alice.) Make sure your computer meets the requirements before you download. Pro Quality. Free. Ages 13+.