Latest Open Source API called PROCESSING

Processing 2 (Release in 2013)

The new form of applet also called Papplet. The goal of this open source program is to Promote software literacy, most importantly within the visual arts and literacy within technology. They introduce the Application Programming Interface (API) and the Processing Development Environment (PDE). The Foundation of Processing 2 Consist of Ben Fry, Casey Reas, and Dan Shiffman.

You can Download this Program From here: Click Here

This is very tough decision to develop without money.For the new implementation they need Donation for making it more powerful and free of cost for the people who want to develop something new with this processing API. 

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Books and many Examples are available on website and also there is a forums for questioning and answering. Tutorials are also provided by the developers. Its language is very simple and easy to use GUI for coding that qualities make it more specific.

Due to the open Source quality you can plug-in many tools with it and improve your creativity thats makes you rich.You can earn with it alot. Create Java, Papplets application with it and make money very easily.

for tutorials and help you can also visit:
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Lot of tutorials are there for newbies.