R-cade is described as 'Simple game engine for kids using the Racket programming language' and is a Programming Language in the Development category. There are more than 10 alternatives to R-cade for a variety of platforms, including Windows, Linux, Online / Web-based, Mac and iPhone. The best alternative is Scratch, which is both free and Open Source. Other great apps like R-cade are Snap! (Free, Open Source), Tynker (Freemium), Cyberix3D (Free) 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.
Learn to code, mod Minecraft and build games with Tynker's easy-to-learn, visual programming courses. Tynker is the online platform that makes it fun to learn computer programming for 4th through 8th graders.
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.