Block Based Programs

Programming Languages

IDE's

Other

Blockly

Like App Inventor, but for the web, originally from Google Code,

Gamesalad

Learn to program by creating your own   games using a powerful visual programming language.

Codea

Coding on the iPad for the iPad

Cargo-bot can be found in the apple store and was created entirely on the iPad using Codea

Processing 

This is a flexible software sketchbook and a language for learning how to code. 

Gamestar Mechanic

Create your own games and learn how to program

Java Script

Create dynamic content for webpages

A good starting place is codecademy