Blue by MIT is described as 'Blue is a mod for Scratch 2.0 that is currently in development'. There are eight alternatives to Blue by MIT for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android Tablet. The best alternative is Scratch, which is both free and Open Source. Other great apps like Blue by MIT are Snap! (Free, Open Source), HyperNext Studio (Free), Blockly (Free, Open Source) and Bingo (Free, Open Source).
Snap! (formerly BYOB) is a visual, drag-and-drop programming language. It is an extended reimplementation of Scratch (a project of the Lifelong Kindergarten Group at the MIT Media Lab) that allows you to Build Your Own Blocks.
Easy Programming for beginners. HyperNext Studio is an easy to use software creation system that allows hobbyists, students, educators, in fact almost anyone, to quickly start building their own software that works.
Bingo is a programming language based on Scratch by MIT which uses a "block" UI, where the user can snap together different blocks to make more advanced scripts. There are many added blocks to Scratch 1.4.
Panther is a programming language aimed at young users with only a small knowledge of programming. Panther offers you a more advanced version of Scratch, a simple programming language developed at MIT.
Coding is the new literacy! With ScratchJr, young children (ages 5-7) can program their own interactive stories and games. In the process, they learn to solve problems, design projects, and express themselves creatively on the computer.