Osmo's latest iPad game lets kids use modular, magnetic blocks to create sets of executable instructions.

Code::Blocks is open source IDE, established in C++ using WX Widgets as the GUI tool kit. Learn how to download & install Code::Block.

Mastering the C programming language - a classic code environment used to build software, apps, and whole operating systems - is a great skill, and Mac OS X makes it easy to learn.

They've designed a set of blocks---physical, electrical blocks---that you can snap together to form a real program. Using these blocks, you could create a musical instrument or an automated toy or ...